Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops

H. P. Osborn; G. Nowak; G. Hébrard; T. Masseron; J. Lillo-Box; E. Pallé; A. Bekkelien; H. G. Florén; P. Guterman; A. E. Simon; V. Adibekyan; A. Bieryla; L. Borsato; A. Brandeker; D. R. Ciardi; A. Collier Cameron; K. A. Collins; J. A. Egger; D. Gandolfi; M. J. Hooton; D. W. Latham; M. Lendl; E. C. Matthews; A. Tuson; S. Ulmer-Moll; A. Vanderburg; T. G. Wilson; C. Ziegler; Y. Alibert; R. Alonso; G. Anglada; L. Arnold; J. Asquier; D. Barrado y Navascues; W. Baumjohann; T. Beck; A. A. Belinski; W. Benz; F. Biondi; I. Boisse; X. Bonfils; C. Broeg; L. A. Buchhave; T. Bárczy; S. C.C. Barros; J. Cabrera; C. Cardona Guillen; I. Carleo; A. Castro-González; S. Charnoz; J. Christiansen; P. Cortes-Zuleta; S. Csizmadia; S. Dalal; M. B. Davies; M. Deleuil; X. Delfosse; L. Delrez; B. O. Demory; A. B. Dunlavey; D. Ehrenreich; A. Erikson; R. B. Fernandes; A. Fortier; T. Forveille; L. Fossati; M. Fridlund; M. Gillon; R. F. Goeke; M. V. Goliguzova; E. J. Gonzales; M. N. Günther; M. Güdel; N. Heidari; C. E. Henze; S. Howell; S. Hoyer; J. I. Frey; K. G. Isaak; J. M. Jenkins; F. Kiefer; L. Kiss; J. Korth; P. F.L. Maxted; J. Laskar; A. Lecavelier des Etangs; C. Lovis; M. B. Lund; R. Luque; D. Magrin; J. M. Almenara; E. Martioli; M. Mecina; J. V. Medina; D. Moldovan; M. Morales-Calderón; G. Morello; C. Moutou; F. Murgas; E. L.N. Jensen; V. Nascimbeni; G. Olofsson; R. Ottensamer; I. Pagano; G. Peter; G. Piotto; D. Pollacco; D. Queloz; R. Ragazzoni; N. Rando; H. Rauer; I. Ribas; G. Ricker; O. D.S. Demangeon; A. M.S. Smith; N. Santos; G. Scandariato; S. Seager; S. G. Sousa; M. Steller; G. M. Szabó; D. Ségransan; N. Thomas; S. Udry; B. Ulmer; V. Van Grootel; R. Vanderspek; N. Walton; J. N. Winn

doi:10.1093/mnras/stad1319

Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops

H. P. Osborn, G. Nowak, G. Hébrard, T. Masseron, J. Lillo-Box, E. Pallé, A. Bekkelien, H. G. Florén, P. Guterman, A. E. Simon, V. Adibekyan, A. Bieryla, L. Borsato, A. Brandeker, D. R. Ciardi, A. Collier Cameron, K. A. Collins, J. A. Egger, D. Gandolfi, M. J. HootonD. W. Latham, M. Lendl, E. C. Matthews, A. Tuson, S. Ulmer-Moll, A. Vanderburg, T. G. Wilson, C. Ziegler, Y. Alibert, R. Alonso, G. Anglada, L. Arnold, J. Asquier, D. Barrado y Navascues, W. Baumjohann, T. Beck, A. A. Belinski, W. Benz, F. Biondi, I. Boisse, X. Bonfils, C. Broeg, L. A. Buchhave, T. Bárczy, S. C.C. Barros, J. Cabrera, C. Cardona Guillen, I. Carleo, A. Castro-González, S. Charnoz, J. Christiansen, P. Cortes-Zuleta, S. Csizmadia, S. Dalal, M. B. Davies, M. Deleuil, X. Delfosse, L. Delrez, B. O. Demory, A. B. Dunlavey, D. Ehrenreich, A. Erikson, R. B. Fernandes, A. Fortier, T. Forveille, L. Fossati, M. Fridlund, M. Gillon, R. F. Goeke, M. V. Goliguzova, E. J. Gonzales, M. N. Günther, M. Güdel, N. Heidari, C. E. Henze, S. Howell, S. Hoyer, J. I. Frey, K. G. Isaak, J. M. Jenkins, F. Kiefer, L. Kiss, J. Korth, P. F.L. Maxted, J. Laskar, A. Lecavelier des Etangs, C. Lovis, M. B. Lund, R. Luque, D. Magrin, J. M. Almenara, E. Martioli, M. Mecina, J. V. Medina, D. Moldovan, M. Morales-Calderón, G. Morello, C. Moutou, F. Murgas, E. L.N. Jensen, V. Nascimbeni, G. Olofsson, R. Ottensamer, I. Pagano, G. Peter, G. Piotto, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, H. Rauer, I. Ribas, G. Ricker, O. D.S. Demangeon, A. M.S. Smith, N. Santos, G. Scandariato, S. Seager, S. G. Sousa, M. Steller, G. M. Szabó, D. Ségransan, N. Thomas, S. Udry, B. Ulmer, V. Van Grootel, R. Vanderspek, N. Walton, J. N. Winn

Astrophysical Sciences

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

15 Scopus citations

Abstract

HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R (HIP 9618 b) and 3.343 ± 0.039 R (HIP 9618 c). While the 20.77291 d period of HIP 9618 b was measured unambiguously, HIP 9618 c showed only two transits separated by a 680-d gap in the time series, leaving many possibilities for the period. To solve this issue, CHEOPS performed targeted photometry of period aliases to attempt to recover the true period of planet c, and successfully determined the true period to be 52.56349 d. High-resolution spectroscopy with HARPS-N, SOPHIE, and CAFE revealed a mass of 10.0 ± 3.1M for HIP 9618 b, which, according to our interior structure models, corresponds to a 6.8 ± 1.4 per cent gas fraction. HIP 9618 c appears to have a lower mass than HIP 9618 b, with a 3-sigma upper limit of <18M. Follow-up and archival RV measurements also reveal a clear long-term trend which, when combined with imaging and astrometric information, reveal a low-mass companion (0.08⁺₋₀⁰₀₅¹²M_☉) orbiting at 26.0⁺₋₁₁¹⁹₀⁰ au. This detection makes HIP 9618 one of only five bright (K < 8 mag) transiting multiplanet systems known to host a planet with P > 50 d, opening the door for the atmospheric characterization of warm (T_eq < 750 K) sub-Neptunes.

Original language	English (US)
Pages (from-to)	3069-3089
Number of pages	21
Journal	Monthly Notices of the Royal Astronomical Society
Volume	523
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stad1319
State	Published - Aug 1 2023

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

binaries: spectroscopic
eclipses
occultations
planets and satellites: detection
surveys

Access to Document

10.1093/mnras/stad1319

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Osborn, H. P., Nowak, G., Hébrard, G., Masseron, T., Lillo-Box, J., Pallé, E., Bekkelien, A., Florén, H. G., Guterman, P., Simon, A. E., Adibekyan, V., Bieryla, A., Borsato, L., Brandeker, A., Ciardi, D. R., Cameron, A. C., Collins, K. A., Egger, J. A., Gandolfi, D., ... Winn, J. N. (2023). Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops. Monthly Notices of the Royal Astronomical Society, 523(2), 3069-3089. https://doi.org/10.1093/mnras/stad1319

@article{89b5fbb6efaa46b9847607812971e8be,

title = "Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops",

abstract = "HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R (HIP 9618 b) and 3.343 ± 0.039 R (HIP 9618 c). While the 20.77291 d period of HIP 9618 b was measured unambiguously, HIP 9618 c showed only two transits separated by a 680-d gap in the time series, leaving many possibilities for the period. To solve this issue, CHEOPS performed targeted photometry of period aliases to attempt to recover the true period of planet c, and successfully determined the true period to be 52.56349 d. High-resolution spectroscopy with HARPS-N, SOPHIE, and CAFE revealed a mass of 10.0 ± 3.1M for HIP 9618 b, which, according to our interior structure models, corresponds to a 6.8 ± 1.4 per cent gas fraction. HIP 9618 c appears to have a lower mass than HIP 9618 b, with a 3-sigma upper limit of <18M. Follow-up and archival RV measurements also reveal a clear long-term trend which, when combined with imaging and astrometric information, reveal a low-mass companion (0.08+−000512M☉) orbiting at 26.0+−111900 au. This detection makes HIP 9618 one of only five bright (K < 8 mag) transiting multiplanet systems known to host a planet with P > 50 d, opening the door for the atmospheric characterization of warm (Teq < 750 K) sub-Neptunes.",

keywords = "binaries: spectroscopic, eclipses, occultations, planets and satellites: detection, surveys",

author = "Osborn, {H. P.} and G. Nowak and G. H{\'e}brard and T. Masseron and J. Lillo-Box and E. Pall{\'e} and A. Bekkelien and Flor{\'e}n, {H. G.} and P. Guterman and Simon, {A. E.} and V. Adibekyan and A. Bieryla and L. Borsato and A. Brandeker and Ciardi, {D. R.} and Cameron, {A. Collier} and Collins, {K. A.} and Egger, {J. A.} and D. Gandolfi and Hooton, {M. J.} and Latham, {D. W.} and M. Lendl and Matthews, {E. C.} and A. Tuson and S. Ulmer-Moll and A. Vanderburg and Wilson, {T. G.} and C. Ziegler and Y. Alibert and R. Alonso and G. Anglada and L. Arnold and J. Asquier and {y Navascues}, {D. Barrado} and W. Baumjohann and T. Beck and Belinski, {A. A.} and W. Benz and F. Biondi and I. Boisse and X. Bonfils and C. Broeg and Buchhave, {L. A.} and T. B{\'a}rczy and Barros, {S. C.C.} and J. Cabrera and Guillen, {C. Cardona} and I. Carleo and A. Castro-Gonz{\'a}lez and S. Charnoz and J. Christiansen and P. Cortes-Zuleta and S. Csizmadia and S. Dalal and Davies, {M. B.} and M. Deleuil and X. Delfosse and L. Delrez and Demory, {B. O.} and Dunlavey, {A. B.} and D. Ehrenreich and A. Erikson and Fernandes, {R. B.} and A. Fortier and T. Forveille and L. Fossati and M. Fridlund and M. Gillon and Goeke, {R. F.} and Goliguzova, {M. V.} and Gonzales, {E. J.} and G{\"u}nther, {M. N.} and M. G{\"u}del and N. Heidari and Henze, {C. E.} and S. Howell and S. Hoyer and Frey, {J. I.} and Isaak, {K. G.} and Jenkins, {J. M.} and F. Kiefer and L. Kiss and J. Korth and Maxted, {P. F.L.} and J. Laskar and {des Etangs}, {A. Lecavelier} and C. Lovis and Lund, {M. B.} and R. Luque and D. Magrin and Almenara, {J. M.} and E. Martioli and M. Mecina and Medina, {J. V.} and D. Moldovan and M. Morales-Calder{\'o}n and G. Morello and C. Moutou and F. Murgas and Jensen, {E. L.N.} and V. Nascimbeni and G. Olofsson and R. Ottensamer and I. Pagano and G. Peter and G. Piotto and D. Pollacco and D. Queloz and R. Ragazzoni and N. Rando and H. Rauer and I. Ribas and G. Ricker and Demangeon, {O. D.S.} and Smith, {A. M.S.} and N. Santos and G. Scandariato and S. Seager and Sousa, {S. G.} and M. Steller and Szab{\'o}, {G. M.} and D. S{\'e}gransan and N. Thomas and S. Udry and B. Ulmer and {Van Grootel}, V. and R. Vanderspek and N. Walton and Winn, {J. N.}",

note = "Publisher Copyright: {\textcopyright} 2023 The Author(s).",

year = "2023",

month = aug,

day = "1",

doi = "10.1093/mnras/stad1319",

language = "English (US)",

volume = "523",

pages = "3069--3089",

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

issn = "0035-8711",

publisher = "Oxford University Press",

number = "2",

}

Osborn, HP, Nowak, G, Hébrard, G, Masseron, T, Lillo-Box, J, Pallé, E, Bekkelien, A, Florén, HG, Guterman, P, Simon, AE, Adibekyan, V, Bieryla, A, Borsato, L, Brandeker, A, Ciardi, DR, Cameron, AC, Collins, KA, Egger, JA, Gandolfi, D, Hooton, MJ, Latham, DW, Lendl, M, Matthews, EC, Tuson, A, Ulmer-Moll, S, Vanderburg, A, Wilson, TG, Ziegler, C, Alibert, Y, Alonso, R, Anglada, G, Arnold, L, Asquier, J, y Navascues, DB, Baumjohann, W, Beck, T, Belinski, AA, Benz, W, Biondi, F, Boisse, I, Bonfils, X, Broeg, C, Buchhave, LA, Bárczy, T, Barros, SCC, Cabrera, J, Guillen, CC, Carleo, I, Castro-González, A, Charnoz, S, Christiansen, J, Cortes-Zuleta, P, Csizmadia, S, Dalal, S, Davies, MB, Deleuil, M, Delfosse, X, Delrez, L, Demory, BO, Dunlavey, AB, Ehrenreich, D, Erikson, A, Fernandes, RB, Fortier, A, Forveille, T, Fossati, L, Fridlund, M, Gillon, M, Goeke, RF, Goliguzova, MV, Gonzales, EJ, Günther, MN, Güdel, M, Heidari, N, Henze, CE, Howell, S, Hoyer, S, Frey, JI, Isaak, KG, Jenkins, JM, Kiefer, F, Kiss, L, Korth, J, Maxted, PFL, Laskar, J, des Etangs, AL, Lovis, C, Lund, MB, Luque, R, Magrin, D, Almenara, JM, Martioli, E, Mecina, M, Medina, JV, Moldovan, D, Morales-Calderón, M, Morello, G, Moutou, C, Murgas, F, Jensen, ELN, Nascimbeni, V, Olofsson, G, Ottensamer, R, Pagano, I, Peter, G, Piotto, G, Pollacco, D, Queloz, D, Ragazzoni, R, Rando, N, Rauer, H, Ribas, I, Ricker, G, Demangeon, ODS, Smith, AMS, Santos, N, Scandariato, G, Seager, S, Sousa, SG, Steller, M, Szabó, GM, Ségransan, D, Thomas, N, Udry, S, Ulmer, B, Van Grootel, V, Vanderspek, R, Walton, N & Winn, JN 2023, 'Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops', Monthly Notices of the Royal Astronomical Society, vol. 523, no. 2, pp. 3069-3089. https://doi.org/10.1093/mnras/stad1319

TY - JOUR

T1 - Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops

AU - Osborn, H. P.

AU - Nowak, G.

AU - Hébrard, G.

AU - Masseron, T.

AU - Lillo-Box, J.

AU - Pallé, E.

AU - Bekkelien, A.

AU - Florén, H. G.

AU - Guterman, P.

AU - Simon, A. E.

AU - Adibekyan, V.

AU - Bieryla, A.

AU - Borsato, L.

AU - Brandeker, A.

AU - Ciardi, D. R.

AU - Cameron, A. Collier

AU - Collins, K. A.

AU - Egger, J. A.

AU - Gandolfi, D.

AU - Hooton, M. J.

AU - Latham, D. W.

AU - Lendl, M.

AU - Matthews, E. C.

AU - Tuson, A.

AU - Ulmer-Moll, S.

AU - Vanderburg, A.

AU - Wilson, T. G.

AU - Ziegler, C.

AU - Alibert, Y.

AU - Alonso, R.

AU - Anglada, G.

AU - Arnold, L.

AU - Asquier, J.

AU - y Navascues, D. Barrado

AU - Baumjohann, W.

AU - Beck, T.

AU - Belinski, A. A.

AU - Benz, W.

AU - Biondi, F.

AU - Boisse, I.

AU - Bonfils, X.

AU - Broeg, C.

AU - Buchhave, L. A.

AU - Bárczy, T.

AU - Barros, S. C.C.

AU - Cabrera, J.

AU - Guillen, C. Cardona

AU - Carleo, I.

AU - Castro-González, A.

AU - Charnoz, S.

AU - Christiansen, J.

AU - Cortes-Zuleta, P.

AU - Csizmadia, S.

AU - Dalal, S.

AU - Davies, M. B.

AU - Deleuil, M.

AU - Delfosse, X.

AU - Delrez, L.

AU - Demory, B. O.

AU - Dunlavey, A. B.

AU - Ehrenreich, D.

AU - Erikson, A.

AU - Fernandes, R. B.

AU - Fortier, A.

AU - Forveille, T.

AU - Fossati, L.

AU - Fridlund, M.

AU - Gillon, M.

AU - Goeke, R. F.

AU - Goliguzova, M. V.

AU - Gonzales, E. J.

AU - Günther, M. N.

AU - Güdel, M.

AU - Heidari, N.

AU - Henze, C. E.

AU - Howell, S.

AU - Hoyer, S.

AU - Frey, J. I.

AU - Isaak, K. G.

AU - Jenkins, J. M.

AU - Kiefer, F.

AU - Kiss, L.

AU - Korth, J.

AU - Maxted, P. F.L.

AU - Laskar, J.

AU - des Etangs, A. Lecavelier

AU - Lovis, C.

AU - Lund, M. B.

AU - Luque, R.

AU - Magrin, D.

AU - Almenara, J. M.

AU - Martioli, E.

AU - Mecina, M.

AU - Medina, J. V.

AU - Moldovan, D.

AU - Morales-Calderón, M.

AU - Morello, G.

AU - Moutou, C.

AU - Murgas, F.

AU - Jensen, E. L.N.

AU - Nascimbeni, V.

AU - Olofsson, G.

AU - Ottensamer, R.

AU - Pagano, I.

AU - Peter, G.

AU - Piotto, G.

AU - Pollacco, D.

AU - Queloz, D.

AU - Ragazzoni, R.

AU - Rando, N.

AU - Rauer, H.

AU - Ribas, I.

AU - Ricker, G.

AU - Demangeon, O. D.S.

AU - Smith, A. M.S.

AU - Santos, N.

AU - Scandariato, G.

AU - Seager, S.

AU - Sousa, S. G.

AU - Steller, M.

AU - Szabó, G. M.

AU - Ségransan, D.

AU - Thomas, N.

AU - Udry, S.

AU - Ulmer, B.

AU - Van Grootel, V.

AU - Vanderspek, R.

AU - Walton, N.

AU - Winn, J. N.

PY - 2023/8/1

Y1 - 2023/8/1

N2 - HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R (HIP 9618 b) and 3.343 ± 0.039 R (HIP 9618 c). While the 20.77291 d period of HIP 9618 b was measured unambiguously, HIP 9618 c showed only two transits separated by a 680-d gap in the time series, leaving many possibilities for the period. To solve this issue, CHEOPS performed targeted photometry of period aliases to attempt to recover the true period of planet c, and successfully determined the true period to be 52.56349 d. High-resolution spectroscopy with HARPS-N, SOPHIE, and CAFE revealed a mass of 10.0 ± 3.1M for HIP 9618 b, which, according to our interior structure models, corresponds to a 6.8 ± 1.4 per cent gas fraction. HIP 9618 c appears to have a lower mass than HIP 9618 b, with a 3-sigma upper limit of <18M. Follow-up and archival RV measurements also reveal a clear long-term trend which, when combined with imaging and astrometric information, reveal a low-mass companion (0.08+−000512M☉) orbiting at 26.0+−111900 au. This detection makes HIP 9618 one of only five bright (K < 8 mag) transiting multiplanet systems known to host a planet with P > 50 d, opening the door for the atmospheric characterization of warm (Teq < 750 K) sub-Neptunes.

AB - HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R (HIP 9618 b) and 3.343 ± 0.039 R (HIP 9618 c). While the 20.77291 d period of HIP 9618 b was measured unambiguously, HIP 9618 c showed only two transits separated by a 680-d gap in the time series, leaving many possibilities for the period. To solve this issue, CHEOPS performed targeted photometry of period aliases to attempt to recover the true period of planet c, and successfully determined the true period to be 52.56349 d. High-resolution spectroscopy with HARPS-N, SOPHIE, and CAFE revealed a mass of 10.0 ± 3.1M for HIP 9618 b, which, according to our interior structure models, corresponds to a 6.8 ± 1.4 per cent gas fraction. HIP 9618 c appears to have a lower mass than HIP 9618 b, with a 3-sigma upper limit of <18M. Follow-up and archival RV measurements also reveal a clear long-term trend which, when combined with imaging and astrometric information, reveal a low-mass companion (0.08+−000512M☉) orbiting at 26.0+−111900 au. This detection makes HIP 9618 one of only five bright (K < 8 mag) transiting multiplanet systems known to host a planet with P > 50 d, opening the door for the atmospheric characterization of warm (Teq < 750 K) sub-Neptunes.

KW - binaries: spectroscopic

KW - eclipses

KW - occultations

KW - planets and satellites: detection

KW - surveys

UR - http://www.scopus.com/inward/record.url?scp=85162768259&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85162768259&partnerID=8YFLogxK

U2 - 10.1093/mnras/stad1319

DO - 10.1093/mnras/stad1319

M3 - Article

AN - SCOPUS:85162768259

SN - 0035-8711

VL - 523

SP - 3069

EP - 3089

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops

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