HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star

N. Heidari; I. Boisse; J. Orell-Miquel; G. Hébrard; L. Acuña; N. C. Hara; J. Lillo-Box; J. D. Eastman; L. Arnold; N. Astudillo-Defru; V. Adibekyan; A. Bieryla; X. Bonfils; F. Bouchy; T. Barclay; C. E. Brasseur; S. Borgniet; V. Bourrier; L. Buchhave; A. Behmard; C. Beard; N. M. Batalha; B. Courcol; P. Cortés-Zuleta; K. Collins; A. Carmona; I. J.M. Crossfield; A. Chontos; X. Delfosse; S. Dalal; M. Deleuil; O. D.S. Demangeon; R. F. Diáz; X. Dumusque; T. Daylan; D. Dragomir; E. Delgado Mena; C. Dressing; F. Dai; P. A. Dalba; D. Ehrenreich; T. Forveille; B. Fulton; T. Fetherolf; G. Gaisné; S. Giacalone; N. Riazi; S. Hoyer; M. J. Hobson; A. W. Howard; D. Huber; M. L. Hill; L. A. Hirsch; H. Isaacson; J. Jenkins; S. R. Kane; F. Kiefer; R. Luque; D. W. Latham; J. Lubin; T. Lopez; O. Mousis; C. Moutou; G. Montagnier; L. Mignon; A. Mayo; T. Močnik; J. M.A. Murphy; E. Palle; F. Pepe; E. A. Petigura; J. Rey; G. Ricker; P. Robertson; A. Roy; R. A. Rubenzahl; L. J. Rosenthal; A. Santerne; N. C. Santos; S. G. Sousa; K. G. Stassun; M. Stalport; N. Scarsdale; P. A. Strøm; S. Seager; D. Segransan; P. Tenenbaum; R. Tronsgaard; S. Udry; R. Vanderspek; F. Vakili; J. Winn; L. M. Weiss

doi:10.1051/0004-6361/202141429

HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star

N. Heidari, I. Boisse, J. Orell-Miquel, G. Hébrard, L. Acuña, N. C. Hara, J. Lillo-Box, J. D. Eastman, L. Arnold, N. Astudillo-Defru, V. Adibekyan, A. Bieryla, X. Bonfils, F. Bouchy, T. Barclay, C. E. Brasseur, S. Borgniet, V. Bourrier, L. Buchhave, A. BehmardC. Beard, N. M. Batalha, B. Courcol, P. Cortés-Zuleta, K. Collins, A. Carmona, I. J.M. Crossfield, A. Chontos, X. Delfosse, S. Dalal, M. Deleuil, O. D.S. Demangeon, R. F. Diáz, X. Dumusque, T. Daylan, D. Dragomir, E. Delgado Mena, C. Dressing, F. Dai, P. A. Dalba, D. Ehrenreich, T. Forveille, B. Fulton, T. Fetherolf, G. Gaisné, S. Giacalone, N. Riazi, S. Hoyer, M. J. Hobson, A. W. Howard, D. Huber, M. L. Hill, L. A. Hirsch, H. Isaacson, J. Jenkins, S. R. Kane, F. Kiefer, R. Luque, D. W. Latham, J. Lubin, T. Lopez, O. Mousis, C. Moutou, G. Montagnier, L. Mignon, A. Mayo, T. Močnik, J. M.A. Murphy, E. Palle, F. Pepe, E. A. Petigura, J. Rey, G. Ricker, P. Robertson, A. Roy, R. A. Rubenzahl, L. J. Rosenthal, A. Santerne, N. C. Santos, S. G. Sousa, K. G. Stassun, M. Stalport, N. Scarsdale, P. A. Strøm, S. Seager, D. Segransan, P. Tenenbaum, R. Tronsgaard, S. Udry, R. Vanderspek, F. Vakili, J. Winn, L. M. Weiss

Astrophysical Sciences

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Abstract

We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet Survey Satellite mission and radial velocity (RV) observations from the SOPHIE, Automated Planet Finder, and HIRES high-precision spectrographs. We used EXOFASTv2 to model the parameters of the planet and its host star simultaneously, combining photometric and RV data to determine the planetary system parameters. We show that the planet has a radius of 2.50 ± 0.08 RE and a mass of either 14.4 ± 1.6 ME or 15.9 ± 1.6 ME with nearly equal probability. The two solutions correspond to two possibilities for the stellar activity period. The density accordingly is either 5.1 ± 0.7 g cm3 or 5.50.7+0.8 g cm3, making it one of the relatively rare dense sub-Neptunes. The existence of this dense planet at only 0.12 AU from its host star is unusual in the currently observed sub-Neptune (2 < RE < 4) population. The most likely scenario is that this planet has migrated to its current position.

Original language	English (US)
Article number	A176
Journal	Astronomy and Astrophysics
Volume	658
DOIs	https://doi.org/10.1051/0004-6361/202141429
State	Published - Feb 1 2022

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361/202141429

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Heidari, N., Boisse, I., Orell-Miquel, J., Hébrard, G., Acuña, L., Hara, N. C., Lillo-Box, J., Eastman, J. D., Arnold, L., Astudillo-Defru, N., Adibekyan, V., Bieryla, A., Bonfils, X., Bouchy, F., Barclay, T., Brasseur, C. E., Borgniet, S., Bourrier, V., Buchhave, L., ... Weiss, L. M. (2022). HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star. Astronomy and Astrophysics, 658, Article A176. https://doi.org/10.1051/0004-6361/202141429

@article{54711e59c1924d52ba284a75d4124278,

title = "HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star",

abstract = "We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet Survey Satellite mission and radial velocity (RV) observations from the SOPHIE, Automated Planet Finder, and HIRES high-precision spectrographs. We used EXOFASTv2 to model the parameters of the planet and its host star simultaneously, combining photometric and RV data to determine the planetary system parameters. We show that the planet has a radius of 2.50 ± 0.08 RE and a mass of either 14.4 ± 1.6 ME or 15.9 ± 1.6 ME with nearly equal probability. The two solutions correspond to two possibilities for the stellar activity period. The density accordingly is either 5.1 ± 0.7 g cm3 or 5.50.7+0.8 g cm3, making it one of the relatively rare dense sub-Neptunes. The existence of this dense planet at only 0.12 AU from its host star is unusual in the currently observed sub-Neptune (2 < RE < 4) population. The most likely scenario is that this planet has migrated to its current position.",

author = "N. Heidari and I. Boisse and J. Orell-Miquel and G. H{\'e}brard and L. Acu{\~n}a and Hara, {N. C.} and J. Lillo-Box and Eastman, {J. D.} and L. Arnold and N. Astudillo-Defru and V. Adibekyan and A. Bieryla and X. Bonfils and F. Bouchy and T. Barclay and Brasseur, {C. E.} and S. Borgniet and V. Bourrier and L. Buchhave and A. Behmard and C. Beard and Batalha, {N. M.} and B. Courcol and P. Cort{\'e}s-Zuleta and K. Collins and A. Carmona and Crossfield, {I. J.M.} and A. Chontos and X. Delfosse and S. Dalal and M. Deleuil and Demangeon, {O. D.S.} and Di{\'a}z, {R. F.} and X. Dumusque and T. Daylan and D. Dragomir and {Delgado Mena}, E. and C. Dressing and F. Dai and Dalba, {P. A.} and D. Ehrenreich and T. Forveille and B. Fulton and T. Fetherolf and G. Gaisn{\'e} and S. Giacalone and N. Riazi and S. Hoyer and Hobson, {M. J.} and Howard, {A. W.} and D. Huber and Hill, {M. L.} and Hirsch, {L. A.} and H. Isaacson and J. Jenkins and Kane, {S. R.} and F. Kiefer and R. Luque and Latham, {D. W.} and J. Lubin and T. Lopez and O. Mousis and C. Moutou and G. Montagnier and L. Mignon and A. Mayo and T. Mo{\v c}nik and Murphy, {J. M.A.} and E. Palle and F. Pepe and Petigura, {E. A.} and J. Rey and G. Ricker and P. Robertson and A. Roy and Rubenzahl, {R. A.} and Rosenthal, {L. J.} and A. Santerne and Santos, {N. C.} and Sousa, {S. G.} and Stassun, {K. G.} and M. Stalport and N. Scarsdale and Str{\o}m, {P. A.} and S. Seager and D. Segransan and P. Tenenbaum and R. Tronsgaard and S. Udry and R. Vanderspek and F. Vakili and J. Winn and Weiss, {L. M.}",

note = "Publisher Copyright: {\textcopyright} ",

year = "2022",

month = feb,

day = "1",

doi = "10.1051/0004-6361/202141429",

language = "English (US)",

volume = "658",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

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Heidari, N, Boisse, I, Orell-Miquel, J, Hébrard, G, Acuña, L, Hara, NC, Lillo-Box, J, Eastman, JD, Arnold, L, Astudillo-Defru, N, Adibekyan, V, Bieryla, A, Bonfils, X, Bouchy, F, Barclay, T, Brasseur, CE, Borgniet, S, Bourrier, V, Buchhave, L, Behmard, A, Beard, C, Batalha, NM, Courcol, B, Cortés-Zuleta, P, Collins, K, Carmona, A, Crossfield, IJM, Chontos, A, Delfosse, X, Dalal, S, Deleuil, M, Demangeon, ODS, Diáz, RF, Dumusque, X, Daylan, T, Dragomir, D, Delgado Mena, E, Dressing, C, Dai, F, Dalba, PA, Ehrenreich, D, Forveille, T, Fulton, B, Fetherolf, T, Gaisné, G, Giacalone, S, Riazi, N, Hoyer, S, Hobson, MJ, Howard, AW, Huber, D, Hill, ML, Hirsch, LA, Isaacson, H, Jenkins, J, Kane, SR, Kiefer, F, Luque, R, Latham, DW, Lubin, J, Lopez, T, Mousis, O, Moutou, C, Montagnier, G, Mignon, L, Mayo, A, Močnik, T, Murphy, JMA, Palle, E, Pepe, F, Petigura, EA, Rey, J, Ricker, G, Robertson, P, Roy, A, Rubenzahl, RA, Rosenthal, LJ, Santerne, A, Santos, NC, Sousa, SG, Stassun, KG, Stalport, M, Scarsdale, N, Strøm, PA, Seager, S, Segransan, D, Tenenbaum, P, Tronsgaard, R, Udry, S, Vanderspek, R, Vakili, F, Winn, J & Weiss, LM 2022, 'HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star', Astronomy and Astrophysics, vol. 658, A176. https://doi.org/10.1051/0004-6361/202141429

TY - JOUR

T1 - HD 207897 b

T2 - A dense sub-Neptune transiting a nearby and bright K-type star

AU - Heidari, N.

AU - Boisse, I.

AU - Orell-Miquel, J.

AU - Hébrard, G.

AU - Acuña, L.

AU - Hara, N. C.

AU - Lillo-Box, J.

AU - Eastman, J. D.

AU - Arnold, L.

AU - Astudillo-Defru, N.

AU - Adibekyan, V.

AU - Bieryla, A.

AU - Bonfils, X.

AU - Bouchy, F.

AU - Barclay, T.

AU - Brasseur, C. E.

AU - Borgniet, S.

AU - Bourrier, V.

AU - Buchhave, L.

AU - Behmard, A.

AU - Beard, C.

AU - Batalha, N. M.

AU - Courcol, B.

AU - Cortés-Zuleta, P.

AU - Collins, K.

AU - Carmona, A.

AU - Crossfield, I. J.M.

AU - Chontos, A.

AU - Delfosse, X.

AU - Dalal, S.

AU - Deleuil, M.

AU - Demangeon, O. D.S.

AU - Diáz, R. F.

AU - Dumusque, X.

AU - Daylan, T.

AU - Dragomir, D.

AU - Delgado Mena, E.

AU - Dressing, C.

AU - Dai, F.

AU - Dalba, P. A.

AU - Ehrenreich, D.

AU - Forveille, T.

AU - Fulton, B.

AU - Fetherolf, T.

AU - Gaisné, G.

AU - Giacalone, S.

AU - Riazi, N.

AU - Hoyer, S.

AU - Hobson, M. J.

AU - Howard, A. W.

AU - Huber, D.

AU - Hill, M. L.

AU - Hirsch, L. A.

AU - Isaacson, H.

AU - Jenkins, J.

AU - Kane, S. R.

AU - Kiefer, F.

AU - Luque, R.

AU - Latham, D. W.

AU - Lubin, J.

AU - Lopez, T.

AU - Mousis, O.

AU - Moutou, C.

AU - Montagnier, G.

AU - Mignon, L.

AU - Mayo, A.

AU - Močnik, T.

AU - Murphy, J. M.A.

AU - Palle, E.

AU - Pepe, F.

AU - Petigura, E. A.

AU - Rey, J.

AU - Ricker, G.

AU - Robertson, P.

AU - Roy, A.

AU - Rubenzahl, R. A.

AU - Rosenthal, L. J.

AU - Santerne, A.

AU - Santos, N. C.

AU - Sousa, S. G.

AU - Stassun, K. G.

AU - Stalport, M.

AU - Scarsdale, N.

AU - Strøm, P. A.

AU - Seager, S.

AU - Segransan, D.

AU - Tenenbaum, P.

AU - Tronsgaard, R.

AU - Udry, S.

AU - Vanderspek, R.

AU - Vakili, F.

AU - Winn, J.

AU - Weiss, L. M.

PY - 2022/2/1

Y1 - 2022/2/1

N2 - We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet Survey Satellite mission and radial velocity (RV) observations from the SOPHIE, Automated Planet Finder, and HIRES high-precision spectrographs. We used EXOFASTv2 to model the parameters of the planet and its host star simultaneously, combining photometric and RV data to determine the planetary system parameters. We show that the planet has a radius of 2.50 ± 0.08 RE and a mass of either 14.4 ± 1.6 ME or 15.9 ± 1.6 ME with nearly equal probability. The two solutions correspond to two possibilities for the stellar activity period. The density accordingly is either 5.1 ± 0.7 g cm3 or 5.50.7+0.8 g cm3, making it one of the relatively rare dense sub-Neptunes. The existence of this dense planet at only 0.12 AU from its host star is unusual in the currently observed sub-Neptune (2 < RE < 4) population. The most likely scenario is that this planet has migrated to its current position.

AB - We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet Survey Satellite mission and radial velocity (RV) observations from the SOPHIE, Automated Planet Finder, and HIRES high-precision spectrographs. We used EXOFASTv2 to model the parameters of the planet and its host star simultaneously, combining photometric and RV data to determine the planetary system parameters. We show that the planet has a radius of 2.50 ± 0.08 RE and a mass of either 14.4 ± 1.6 ME or 15.9 ± 1.6 ME with nearly equal probability. The two solutions correspond to two possibilities for the stellar activity period. The density accordingly is either 5.1 ± 0.7 g cm3 or 5.50.7+0.8 g cm3, making it one of the relatively rare dense sub-Neptunes. The existence of this dense planet at only 0.12 AU from its host star is unusual in the currently observed sub-Neptune (2 < RE < 4) population. The most likely scenario is that this planet has migrated to its current position.

UR - http://www.scopus.com/inward/record.url?scp=85125405600&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85125405600&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/202141429

DO - 10.1051/0004-6361/202141429

M3 - Article

AN - SCOPUS:85125405600

SN - 0004-6361

VL - 658

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A176

ER -

HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star

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