TOI−757 b: an eccentric transiting mini−Neptune on a 17.5−d orbit

A. Alqasim; N. Grieves; N. M. Rosário; D. Gandolfi; J. H. Livingston; S. Sousa; K. A. Collins; J. K. Teske; M. Fridlund; J. A. Egger; J. Cabrera; C. Hellier; A. F. Lanza; V. Van Eylen; F. Bouchy; R. J. Oelkers; G. Srdoc; S. Shectman; M. Günther; E. Goffo; T. Wilson; L. M. Serrano; A. Brandeker; S. X. Wang; A. Heitzmann; A. Bonfanti; L. Fossati; Y. Alibert; L. Delrez; R. Sefako; S. Barros; K. I. Collins; O. D.S. Demangeon; S. H. Albrecht; R. Alonso; J. Asquier; T. Barczy; D. Barrado; W. Baumjohann; T. Beck; W. Benz; N. Billot; L. Borsato; C. Broeg; E. M. Bryant; R. P. Butler; W. D. Cochran; A. Collier Cameron; A. C.M. Correia; J. D. Crane; Sz Csizmadia; P. E. Cubillos; M. B. Davies; T. Daylan; M. Deleuil; A. Deline; B. O. Demory; A. Derekas; B. Edwards; D. Ehrenreich; A. Erikson; Z. Essack; A. Fortier; K. Gazeas; M. Gillon; M. Gudel; J. Hasiba; A. P. Hatzes; Ch Helling; T. Hirano; S. B. Howell; S. Hoyer; K. G. Isaak; J. M. Jenkins; S. Kanodia; L. L. Kiss; J. Korth; K. W.F. Lam; J. Laskar; A. Lecavelier des Etangs; M. Lendl; M. B. Lund; R. Luque; A. W. Mann; D. Magrin; P. F.L. Maxted; C. Mordasini; N. Narita; V. Nascimbeni; G. Nowak; G. Olofsson; H. P. Osborn; H. L.M. Osborne; D. Osip; R. Ottensamer; I. Pagano; E. Palle; G. Peter; G. Piotto; D. Pollacco; D. Queloz; R. Ragazzoni; N. Rando; H. Rauer; S. Redfield; I. Ribas; M. Rice; G. R. Ricker; M. Rieder; S. Salmon; N. C. Santos; G. Scandariato; S. Seager; D. Segransan; A. Shporer; A. E. Simon; A. M.S. Smith; M. Stalport; Gy M. Szabo; I. Thompson; J. D. Twicken; S. Udry; R. Vanderspek; V. Van Grootel; J. Venturini; E. Villaver; J. Villaseñor; V. Viotto; I. Walter; N. A. Walton; J. N. Winn; S. W. Yee

doi:10.1093/mnras/stae1767

TOI−757 b: an eccentric transiting mini−Neptune on a 17.5−d orbit

A. Alqasim, N. Grieves, N. M. Rosário, D. Gandolfi, J. H. Livingston, S. Sousa, K. A. Collins, J. K. Teske, M. Fridlund, J. A. Egger, J. Cabrera, C. Hellier, A. F. Lanza, V. Van Eylen, F. Bouchy, R. J. Oelkers, G. Srdoc, S. Shectman, M. Günther, E. GoffoT. Wilson, L. M. Serrano, A. Brandeker, S. X. Wang, A. Heitzmann, A. Bonfanti, L. Fossati, Y. Alibert, L. Delrez, R. Sefako, S. Barros, K. I. Collins, O. D.S. Demangeon, S. H. Albrecht, R. Alonso, J. Asquier, T. Barczy, D. Barrado, W. Baumjohann, T. Beck, W. Benz, N. Billot, L. Borsato, C. Broeg, E. M. Bryant, R. P. Butler, W. D. Cochran, A. Collier Cameron, A. C.M. Correia, J. D. Crane, Sz Csizmadia, P. E. Cubillos, M. B. Davies, T. Daylan, M. Deleuil, A. Deline, B. O. Demory, A. Derekas, B. Edwards, D. Ehrenreich, A. Erikson, Z. Essack, A. Fortier, K. Gazeas, M. Gillon, M. Gudel, J. Hasiba, A. P. Hatzes, Ch Helling, T. Hirano, S. B. Howell, S. Hoyer, K. G. Isaak, J. M. Jenkins, S. Kanodia, L. L. Kiss, J. Korth, K. W.F. Lam, J. Laskar, A. Lecavelier des Etangs, M. Lendl, M. B. Lund, R. Luque, A. W. Mann, D. Magrin, P. F.L. Maxted, C. Mordasini, N. Narita, V. Nascimbeni, G. Nowak, G. Olofsson, H. P. Osborn, H. L.M. Osborne, D. Osip, R. Ottensamer, I. Pagano, E. Palle, G. Peter, G. Piotto, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, H. Rauer, S. Redfield, I. Ribas, M. Rice, G. R. Ricker, M. Rieder, S. Salmon, N. C. Santos, G. Scandariato, S. Seager, D. Segransan, A. Shporer, A. E. Simon, A. M.S. Smith, M. Stalport, Gy M. Szabo, I. Thompson, J. D. Twicken, S. Udry, R. Vanderspek, V. Van Grootel, J. Venturini, E. Villaver, J. Villaseñor, V. Viotto, I. Walter, N. A. Walton, J. N. Winn, S. W. Yee

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

We report the spectroscopic confirmation and fundamental properties of TOI−757 b, a mini−Neptune on a 17.5−d orbit transiting a bright star (V = 9.7 mag) discovered by the TESS mission. We acquired high−precision radial velocity measurements with the HARPS, ESPRESSO, and PFS spectrographs to confirm the planet detection and determine its mass. We also acquired space−borne transit photometry with the CHEOPS space telescope to place stronger constraints on the planet radius, supported with ground−based LCOGT photometry. WASP and KELT photometry were used to help constrain the stellar rotation period. We also determined the fundamental parameters of the host star. We find that TOI−757 b has a radius of R_p = 2.5 ± 0.1R_. and a mass of M_p = 10.5⁺₋₂²₁²M, implying a bulk density of ρ_p = 3.6 ± 0.8 g cm⁻³. Our internal composition modelling was unable to constrain the composition of TOI−757 b, highlighting the importance of atmospheric observations for the system. We also find the planet to be highly eccentric with e = 0.39⁺₋₀⁰₀₇⁰⁸, making it one of the very few highly eccentric planets among precisely characterized mini−Neptunes. Based on comparisons to other similar eccentric systems, we find a likely scenario for TOI−757 b’s formation to be high eccentricity migration due to a distant outer companion. We additionally propose the possibility of a more intrinsic explanation for the high eccentricity due to star−star interactions during the earlier epoch of the Galactic disc formation, given the low metallicity and older age of TOI−757.

Original language	English (US)
Pages (from-to)	1-26
Number of pages	26
Journal	Monthly Notices of the Royal Astronomical Society
Volume	533
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stae1767
State	Published - Sep 1 2024
Externally published	Yes

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

planets and satellites: composition
planets and satellites: interiors
stars: individual: TOI-757 (TIC 130924120)
techniques: photometric
techniques: radial velocities

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10.1093/mnras/stae1767

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Alqasim, A., Grieves, N., Rosário, N. M., Gandolfi, D., Livingston, J. H., Sousa, S., Collins, K. A., Teske, J. K., Fridlund, M., Egger, J. A., Cabrera, J., Hellier, C., Lanza, A. F., Van Eylen, V., Bouchy, F., Oelkers, R. J., Srdoc, G., Shectman, S., Günther, M., ... Yee, S. W. (2024). TOI−757 b: an eccentric transiting mini−Neptune on a 17.5−d orbit. Monthly Notices of the Royal Astronomical Society, 533(1), 1-26. https://doi.org/10.1093/mnras/stae1767

@article{41c8c79afb6d4b5e83045086298b4f73,

title = "TOI−757 b: an eccentric transiting mini−Neptune on a 17.5−d orbit",

abstract = "We report the spectroscopic confirmation and fundamental properties of TOI−757 b, a mini−Neptune on a 17.5−d orbit transiting a bright star (V = 9.7 mag) discovered by the TESS mission. We acquired high−precision radial velocity measurements with the HARPS, ESPRESSO, and PFS spectrographs to confirm the planet detection and determine its mass. We also acquired space−borne transit photometry with the CHEOPS space telescope to place stronger constraints on the planet radius, supported with ground−based LCOGT photometry. WASP and KELT photometry were used to help constrain the stellar rotation period. We also determined the fundamental parameters of the host star. We find that TOI−757 b has a radius of Rp = 2.5 ± 0.1R. and a mass of Mp = 10.5+−2212M, implying a bulk density of ρp = 3.6 ± 0.8 g cm−3. Our internal composition modelling was unable to constrain the composition of TOI−757 b, highlighting the importance of atmospheric observations for the system. We also find the planet to be highly eccentric with e = 0.39+−000708, making it one of the very few highly eccentric planets among precisely characterized mini−Neptunes. Based on comparisons to other similar eccentric systems, we find a likely scenario for TOI−757 b{\textquoteright}s formation to be high eccentricity migration due to a distant outer companion. We additionally propose the possibility of a more intrinsic explanation for the high eccentricity due to star−star interactions during the earlier epoch of the Galactic disc formation, given the low metallicity and older age of TOI−757.",

keywords = "planets and satellites: composition, planets and satellites: interiors, stars: individual: TOI-757 (TIC 130924120), techniques: photometric, techniques: radial velocities",

author = "A. Alqasim and N. Grieves and Ros{\'a}rio, \{N. M.\} and D. Gandolfi and Livingston, \{J. H.\} and S. Sousa and Collins, \{K. A.\} and Teske, \{J. K.\} and M. Fridlund and Egger, \{J. A.\} and J. Cabrera and C. Hellier and Lanza, \{A. F.\} and \{Van Eylen\}, V. and F. Bouchy and Oelkers, \{R. J.\} and G. Srdoc and S. Shectman and M. G{\"u}nther and E. Goffo and T. Wilson and Serrano, \{L. M.\} and A. Brandeker and Wang, \{S. X.\} and A. Heitzmann and A. Bonfanti and L. Fossati and Y. Alibert and L. Delrez and R. Sefako and S. Barros and Collins, \{K. I.\} and Demangeon, \{O. D.S.\} and Albrecht, \{S. H.\} and R. Alonso and J. Asquier and T. Barczy and D. Barrado and W. Baumjohann and T. Beck and W. Benz and N. Billot and L. Borsato and C. Broeg and Bryant, \{E. M.\} and Butler, \{R. P.\} and Cochran, \{W. D.\} and Cameron, \{A. Collier\} and Correia, \{A. C.M.\} and Crane, \{J. D.\} and Sz Csizmadia and Cubillos, \{P. E.\} and Davies, \{M. B.\} and T. Daylan and M. Deleuil and A. Deline and Demory, \{B. O.\} and A. Derekas and B. Edwards and D. Ehrenreich and A. Erikson and Z. Essack and A. Fortier and K. Gazeas and M. Gillon and M. Gudel and J. Hasiba and Hatzes, \{A. P.\} and Ch Helling and T. Hirano and Howell, \{S. B.\} and S. Hoyer and Isaak, \{K. G.\} and Jenkins, \{J. M.\} and S. Kanodia and Kiss, \{L. L.\} and J. Korth and Lam, \{K. W.F.\} and J. Laskar and \{des Etangs\}, \{A. Lecavelier\} and M. Lendl and Lund, \{M. B.\} and R. Luque and Mann, \{A. W.\} and D. Magrin and Maxted, \{P. F.L.\} and C. Mordasini and N. Narita and V. Nascimbeni and G. Nowak and G. Olofsson and Osborn, \{H. P.\} and Osborne, \{H. L.M.\} and D. Osip and R. Ottensamer and I. Pagano and E. Palle and G. Peter and G. Piotto and D. Pollacco and D. Queloz and R. Ragazzoni and N. Rando and H. Rauer and S. Redfield and I. Ribas and M. Rice and Ricker, \{G. R.\} and M. Rieder and S. Salmon and Santos, \{N. C.\} and G. Scandariato and S. Seager and D. Segransan and A. Shporer and Simon, \{A. E.\} and Smith, \{A. M.S.\} and M. Stalport and Szabo, \{Gy M.\} and I. Thompson and Twicken, \{J. D.\} and S. Udry and R. Vanderspek and \{Van Grootel\}, V. and J. Venturini and E. Villaver and J. Villase{\~n}or and V. Viotto and I. Walter and Walton, \{N. A.\} and Winn, \{J. N.\} and Yee, \{S. W.\}",

note = "Publisher Copyright: {\textcopyright} 2024 The Author(s).",

year = "2024",

month = sep,

day = "1",

doi = "10.1093/mnras/stae1767",

language = "English (US)",

volume = "533",

pages = "1--26",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "1",

}

Alqasim, A, Grieves, N, Rosário, NM, Gandolfi, D, Livingston, JH, Sousa, S, Collins, KA, Teske, JK, Fridlund, M, Egger, JA, Cabrera, J, Hellier, C, Lanza, AF, Van Eylen, V, Bouchy, F, Oelkers, RJ, Srdoc, G, Shectman, S, Günther, M, Goffo, E, Wilson, T, Serrano, LM, Brandeker, A, Wang, SX, Heitzmann, A, Bonfanti, A, Fossati, L, Alibert, Y, Delrez, L, Sefako, R, Barros, S, Collins, KI, Demangeon, ODS, Albrecht, SH, Alonso, R, Asquier, J, Barczy, T, Barrado, D, Baumjohann, W, Beck, T, Benz, W, Billot, N, Borsato, L, Broeg, C, Bryant, EM, Butler, RP, Cochran, WD, Cameron, AC, Correia, ACM, Crane, JD, Csizmadia, S, Cubillos, PE, Davies, MB, Daylan, T, Deleuil, M, Deline, A, Demory, BO, Derekas, A, Edwards, B, Ehrenreich, D, Erikson, A, Essack, Z, Fortier, A, Gazeas, K, Gillon, M, Gudel, M, Hasiba, J, Hatzes, AP, Helling, C, Hirano, T, Howell, SB, Hoyer, S, Isaak, KG, Jenkins, JM, Kanodia, S, Kiss, LL, Korth, J, Lam, KWF, Laskar, J, des Etangs, AL, Lendl, M, Lund, MB, Luque, R, Mann, AW, Magrin, D, Maxted, PFL, Mordasini, C, Narita, N, Nascimbeni, V, Nowak, G, Olofsson, G, Osborn, HP, Osborne, HLM, Osip, D, Ottensamer, R, Pagano, I, Palle, E, Peter, G, Piotto, G, Pollacco, D, Queloz, D, Ragazzoni, R, Rando, N, Rauer, H, Redfield, S, Ribas, I, Rice, M, Ricker, GR, Rieder, M, Salmon, S, Santos, NC, Scandariato, G, Seager, S, Segransan, D, Shporer, A, Simon, AE, Smith, AMS, Stalport, M, Szabo, GM, Thompson, I, Twicken, JD, Udry, S, Vanderspek, R, Van Grootel, V, Venturini, J, Villaver, E, Villaseñor, J, Viotto, V, Walter, I, Walton, NA, Winn, JN & Yee, SW 2024, 'TOI−757 b: an eccentric transiting mini−Neptune on a 17.5−d orbit', Monthly Notices of the Royal Astronomical Society, vol. 533, no. 1, pp. 1-26. https://doi.org/10.1093/mnras/stae1767

TY - JOUR

T1 - TOI−757 b

T2 - an eccentric transiting mini−Neptune on a 17.5−d orbit

AU - Alqasim, A.

AU - Grieves, N.

AU - Rosário, N. M.

AU - Gandolfi, D.

AU - Livingston, J. H.

AU - Sousa, S.

AU - Collins, K. A.

AU - Teske, J. K.

AU - Fridlund, M.

AU - Egger, J. A.

AU - Cabrera, J.

AU - Hellier, C.

AU - Lanza, A. F.

AU - Van Eylen, V.

AU - Bouchy, F.

AU - Oelkers, R. J.

AU - Srdoc, G.

AU - Shectman, S.

AU - Günther, M.

AU - Goffo, E.

AU - Wilson, T.

AU - Serrano, L. M.

AU - Brandeker, A.

AU - Wang, S. X.

AU - Heitzmann, A.

AU - Bonfanti, A.

AU - Fossati, L.

AU - Alibert, Y.

AU - Delrez, L.

AU - Sefako, R.

AU - Barros, S.

AU - Collins, K. I.

AU - Demangeon, O. D.S.

AU - Albrecht, S. H.

AU - Alonso, R.

AU - Asquier, J.

AU - Barczy, T.

AU - Barrado, D.

AU - Baumjohann, W.

AU - Beck, T.

AU - Benz, W.

AU - Billot, N.

AU - Borsato, L.

AU - Broeg, C.

AU - Bryant, E. M.

AU - Butler, R. P.

AU - Cochran, W. D.

AU - Cameron, A. Collier

AU - Correia, A. C.M.

AU - Crane, J. D.

AU - Csizmadia, Sz

AU - Cubillos, P. E.

AU - Davies, M. B.

AU - Daylan, T.

AU - Deleuil, M.

AU - Deline, A.

AU - Demory, B. O.

AU - Derekas, A.

AU - Edwards, B.

AU - Ehrenreich, D.

AU - Erikson, A.

AU - Essack, Z.

AU - Fortier, A.

AU - Gazeas, K.

AU - Gillon, M.

AU - Gudel, M.

AU - Hasiba, J.

AU - Hatzes, A. P.

AU - Helling, Ch

AU - Hirano, T.

AU - Howell, S. B.

AU - Hoyer, S.

AU - Isaak, K. G.

AU - Jenkins, J. M.

AU - Kanodia, S.

AU - Kiss, L. L.

AU - Korth, J.

AU - Lam, K. W.F.

AU - Laskar, J.

AU - des Etangs, A. Lecavelier

AU - Lendl, M.

AU - Lund, M. B.

AU - Luque, R.

AU - Mann, A. W.

AU - Magrin, D.

AU - Maxted, P. F.L.

AU - Mordasini, C.

AU - Narita, N.

AU - Nascimbeni, V.

AU - Nowak, G.

AU - Olofsson, G.

AU - Osborn, H. P.

AU - Osborne, H. L.M.

AU - Osip, D.

AU - Ottensamer, R.

AU - Pagano, I.

AU - Palle, E.

AU - Peter, G.

AU - Piotto, G.

AU - Pollacco, D.

AU - Queloz, D.

AU - Ragazzoni, R.

AU - Rando, N.

AU - Rauer, H.

AU - Redfield, S.

AU - Ribas, I.

AU - Rice, M.

AU - Ricker, G. R.

AU - Rieder, M.

AU - Salmon, S.

AU - Santos, N. C.

AU - Scandariato, G.

AU - Seager, S.

AU - Segransan, D.

AU - Shporer, A.

AU - Simon, A. E.

AU - Smith, A. M.S.

AU - Stalport, M.

AU - Szabo, Gy M.

AU - Thompson, I.

AU - Twicken, J. D.

AU - Udry, S.

AU - Vanderspek, R.

AU - Van Grootel, V.

AU - Venturini, J.

AU - Villaver, E.

AU - Villaseñor, J.

AU - Viotto, V.

AU - Walter, I.

AU - Walton, N. A.

AU - Winn, J. N.

AU - Yee, S. W.

PY - 2024/9/1

Y1 - 2024/9/1

N2 - We report the spectroscopic confirmation and fundamental properties of TOI−757 b, a mini−Neptune on a 17.5−d orbit transiting a bright star (V = 9.7 mag) discovered by the TESS mission. We acquired high−precision radial velocity measurements with the HARPS, ESPRESSO, and PFS spectrographs to confirm the planet detection and determine its mass. We also acquired space−borne transit photometry with the CHEOPS space telescope to place stronger constraints on the planet radius, supported with ground−based LCOGT photometry. WASP and KELT photometry were used to help constrain the stellar rotation period. We also determined the fundamental parameters of the host star. We find that TOI−757 b has a radius of Rp = 2.5 ± 0.1R. and a mass of Mp = 10.5+−2212M, implying a bulk density of ρp = 3.6 ± 0.8 g cm−3. Our internal composition modelling was unable to constrain the composition of TOI−757 b, highlighting the importance of atmospheric observations for the system. We also find the planet to be highly eccentric with e = 0.39+−000708, making it one of the very few highly eccentric planets among precisely characterized mini−Neptunes. Based on comparisons to other similar eccentric systems, we find a likely scenario for TOI−757 b’s formation to be high eccentricity migration due to a distant outer companion. We additionally propose the possibility of a more intrinsic explanation for the high eccentricity due to star−star interactions during the earlier epoch of the Galactic disc formation, given the low metallicity and older age of TOI−757.

AB - We report the spectroscopic confirmation and fundamental properties of TOI−757 b, a mini−Neptune on a 17.5−d orbit transiting a bright star (V = 9.7 mag) discovered by the TESS mission. We acquired high−precision radial velocity measurements with the HARPS, ESPRESSO, and PFS spectrographs to confirm the planet detection and determine its mass. We also acquired space−borne transit photometry with the CHEOPS space telescope to place stronger constraints on the planet radius, supported with ground−based LCOGT photometry. WASP and KELT photometry were used to help constrain the stellar rotation period. We also determined the fundamental parameters of the host star. We find that TOI−757 b has a radius of Rp = 2.5 ± 0.1R. and a mass of Mp = 10.5+−2212M, implying a bulk density of ρp = 3.6 ± 0.8 g cm−3. Our internal composition modelling was unable to constrain the composition of TOI−757 b, highlighting the importance of atmospheric observations for the system. We also find the planet to be highly eccentric with e = 0.39+−000708, making it one of the very few highly eccentric planets among precisely characterized mini−Neptunes. Based on comparisons to other similar eccentric systems, we find a likely scenario for TOI−757 b’s formation to be high eccentricity migration due to a distant outer companion. We additionally propose the possibility of a more intrinsic explanation for the high eccentricity due to star−star interactions during the earlier epoch of the Galactic disc formation, given the low metallicity and older age of TOI−757.

KW - planets and satellites: composition

KW - planets and satellites: interiors

KW - stars: individual: TOI-757 (TIC 130924120)

KW - techniques: photometric

KW - techniques: radial velocities

UR - https://www.scopus.com/pages/publications/85200850226

UR - https://www.scopus.com/inward/citedby.url?scp=85200850226&partnerID=8YFLogxK

U2 - 10.1093/mnras/stae1767

DO - 10.1093/mnras/stae1767

M3 - Article

AN - SCOPUS:85200850226

SN - 0035-8711

VL - 533

SP - 1

EP - 26

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

TOI−757 b: an eccentric transiting mini−Neptune on a 17.5−d orbit

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