TOI-220 b: A warm sub-Neptune discovered by TESS

S. Hoyer; D. Gandolfi; D. J. Armstrong; M. Deleuil; L. Acuña; J. R. De Medeiros; E. Goffo; J. Lillo-Box; E. Delgado Mena; T. A. Lopez; A. Santerne; S. Sousa; M. Fridlund; V. Adibekyan; K. A. Collins; L. M. Serrano; P. Cortés-Zuleta; S. B. Howell; H. Deeg; A. Aguichine; O. Barragán; E. M. Bryant; B. L. Canto Martins; K. I. Collins; B. F. Cooke; R. F. Díaz; M. Esposito; E. Furlan; S. Hojjatpanah; J. Jackman; J. M. Jenkins; E. L.N. Jensen; D. W. Latham; I. C. Leão; R. A. Matson; L. D. Nielsen; A. Osborn; J. F. Otegi; F. Rodler; S. Sabotta; N. J. Scott; S. Seager; C. Stockdale; P. A. Strøm; R. Vanderspek; V. Van Eylen; P. J. Wheatley; J. N. Winn; J. M. Almenara; D. Barrado; S. C.C. Barros; D. Bayliss; F. Bouchy; P. T. Boyd; J. Cabrera; W. D. Cochran; O. Demangeon; J. P. Doty; X. Dumusque; P. Figueira; W. Fong; S. Grziwa; A. P. Hatzes; P. Kabáth; E. Knudstrup; J. Korth; J. H. Livingston; R. Luque; O. Mousis; S. E. Mullally; H. P. Osborn; E. Pallé; C. M. Persson; S. Redfield; N. C. Santos; J. Smith; J. Šubjak; J. D. Twicken; S. Udry; D. A. Yahalomi

doi:10.1093/mnras/stab1427

TOI-220 b: A warm sub-Neptune discovered by TESS

S. Hoyer, D. Gandolfi, D. J. Armstrong, M. Deleuil, L. Acuña, J. R. De Medeiros, E. Goffo, J. Lillo-Box, E. Delgado Mena, T. A. Lopez, A. Santerne, S. Sousa, M. Fridlund, V. Adibekyan, K. A. Collins, L. M. Serrano, P. Cortés-Zuleta, S. B. Howell, H. Deeg, A. AguichineO. Barragán, E. M. Bryant, B. L. Canto Martins, K. I. Collins, B. F. Cooke, R. F. Díaz, M. Esposito, E. Furlan, S. Hojjatpanah, J. Jackman, J. M. Jenkins, E. L.N. Jensen, D. W. Latham, I. C. Leão, R. A. Matson, L. D. Nielsen, A. Osborn, J. F. Otegi, F. Rodler, S. Sabotta, N. J. Scott, S. Seager, C. Stockdale, P. A. Strøm, R. Vanderspek, V. Van Eylen, P. J. Wheatley, J. N. Winn, J. M. Almenara, D. Barrado, S. C.C. Barros, D. Bayliss, F. Bouchy, P. T. Boyd, J. Cabrera, W. D. Cochran, O. Demangeon, J. P. Doty, X. Dumusque, P. Figueira, W. Fong, S. Grziwa, A. P. Hatzes, P. Kabáth, E. Knudstrup, J. Korth, J. H. Livingston, R. Luque, O. Mousis, S. E. Mullally, H. P. Osborn, E. Pallé, C. M. Persson, S. Redfield, N. C. Santos, J. Smith, J. Šubjak, J. D. Twicken, S. Udry, D. A. Yahalomi

Astrophysical Sciences

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Abstract

In this paper, we report the discovery of TOI-220 b, a new sub-Neptune detected by the Transiting Exoplanet Survey Satellite (TESS) and confirmed by radial velocity follow-up observations with the HARPS spectrograph. Based on the combined analysis of TESS transit photometry and high precision radial velocity measurements, we estimate a planetary mass of 13.8 ± 1.0 M⊕ and radius of 3.03 ± 0.15 R⊕, implying a bulk density of 2.73 ± 0.47 g cm-3. TOI-220 b orbits a relative bright (V= 10.4) and old (10.1 ± 1.4 Gyr) K dwarf star with a period of ∼10.69 d. Thus, TOI-220 b is a new warm sub-Neptune with very precise mass and radius determinations. A Bayesian analysis of the TOI-220 b internal structure indicates that due to the strong irradiation it receives, the low density of this planet could be explained with a steam atmosphere in radiative-convective equilibrium and a supercritical water layer on top of a differentiated interior made of a silicate mantle and a small iron core.

Original language	English (US)
Pages (from-to)	3361-3379
Number of pages	19
Journal	Monthly Notices of the Royal Astronomical Society
Volume	505
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stab1427
State	Published - Aug 1 2021

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

planets and satellites: fundamental parameters
planets and satellites: individual: TYC 8897-01263-1
stars: fundamental parameters
techniques: photometric
techniques: radial velocities

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10.1093/mnras/stab1427

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Hoyer, S., Gandolfi, D., Armstrong, D. J., Deleuil, M., Acuña, L., De Medeiros, J. R., Goffo, E., Lillo-Box, J., Delgado Mena, E., Lopez, T. A., Santerne, A., Sousa, S., Fridlund, M., Adibekyan, V., Collins, K. A., Serrano, L. M., Cortés-Zuleta, P., Howell, S. B., Deeg, H., ... Yahalomi, D. A. (2021). TOI-220 b: A warm sub-Neptune discovered by TESS. Monthly Notices of the Royal Astronomical Society, 505(3), 3361-3379. https://doi.org/10.1093/mnras/stab1427

@article{7f67061d879641bf81f4c657a2b2b6ee,

title = "TOI-220 b: A warm sub-Neptune discovered by TESS",

abstract = "In this paper, we report the discovery of TOI-220 b, a new sub-Neptune detected by the Transiting Exoplanet Survey Satellite (TESS) and confirmed by radial velocity follow-up observations with the HARPS spectrograph. Based on the combined analysis of TESS transit photometry and high precision radial velocity measurements, we estimate a planetary mass of 13.8 ± 1.0 M⊕ and radius of 3.03 ± 0.15 R⊕, implying a bulk density of 2.73 ± 0.47 g cm-3. TOI-220 b orbits a relative bright (V= 10.4) and old (10.1 ± 1.4 Gyr) K dwarf star with a period of ∼10.69 d. Thus, TOI-220 b is a new warm sub-Neptune with very precise mass and radius determinations. A Bayesian analysis of the TOI-220 b internal structure indicates that due to the strong irradiation it receives, the low density of this planet could be explained with a steam atmosphere in radiative-convective equilibrium and a supercritical water layer on top of a differentiated interior made of a silicate mantle and a small iron core.",

keywords = "planets and satellites: fundamental parameters, planets and satellites: individual: TYC 8897-01263-1, stars: fundamental parameters, techniques: photometric, techniques: radial velocities",

author = "S. Hoyer and D. Gandolfi and Armstrong, {D. J.} and M. Deleuil and L. Acu{\~n}a and {De Medeiros}, {J. R.} and E. Goffo and J. Lillo-Box and {Delgado Mena}, E. and Lopez, {T. A.} and A. Santerne and S. Sousa and M. Fridlund and V. Adibekyan and Collins, {K. A.} and Serrano, {L. M.} and P. Cort{\'e}s-Zuleta and Howell, {S. B.} and H. Deeg and A. Aguichine and O. Barrag{\'a}n and Bryant, {E. M.} and {Canto Martins}, {B. L.} and Collins, {K. I.} and Cooke, {B. F.} and D{\'i}az, {R. F.} and M. Esposito and E. Furlan and S. Hojjatpanah and J. Jackman and Jenkins, {J. M.} and Jensen, {E. L.N.} and Latham, {D. W.} and Le{\~a}o, {I. C.} and Matson, {R. A.} and Nielsen, {L. D.} and A. Osborn and Otegi, {J. F.} and F. Rodler and S. Sabotta and Scott, {N. J.} and S. Seager and C. Stockdale and Str{\o}m, {P. A.} and R. Vanderspek and {Van Eylen}, V. and Wheatley, {P. J.} and Winn, {J. N.} and Almenara, {J. M.} and D. Barrado and Barros, {S. C.C.} and D. Bayliss and F. Bouchy and Boyd, {P. T.} and J. Cabrera and Cochran, {W. D.} and O. Demangeon and Doty, {J. P.} and X. Dumusque and P. Figueira and W. Fong and S. Grziwa and Hatzes, {A. P.} and P. Kab{\'a}th and E. Knudstrup and J. Korth and Livingston, {J. H.} and R. Luque and O. Mousis and Mullally, {S. E.} and Osborn, {H. P.} and E. Pall{\'e} and Persson, {C. M.} and S. Redfield and Santos, {N. C.} and J. Smith and J. {\v S}ubjak and Twicken, {J. D.} and S. Udry and Yahalomi, {D. A.}",

note = "Publisher Copyright: {\textcopyright} 2021 The Author(s).",

year = "2021",

month = aug,

day = "1",

doi = "10.1093/mnras/stab1427",

language = "English (US)",

volume = "505",

pages = "3361--3379",

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

issn = "0035-8711",

publisher = "Oxford University Press",

number = "3",

}

Hoyer, S, Gandolfi, D, Armstrong, DJ, Deleuil, M, Acuña, L, De Medeiros, JR, Goffo, E, Lillo-Box, J, Delgado Mena, E, Lopez, TA, Santerne, A, Sousa, S, Fridlund, M, Adibekyan, V, Collins, KA, Serrano, LM, Cortés-Zuleta, P, Howell, SB, Deeg, H, Aguichine, A, Barragán, O, Bryant, EM, Canto Martins, BL, Collins, KI, Cooke, BF, Díaz, RF, Esposito, M, Furlan, E, Hojjatpanah, S, Jackman, J, Jenkins, JM, Jensen, ELN, Latham, DW, Leão, IC, Matson, RA, Nielsen, LD, Osborn, A, Otegi, JF, Rodler, F, Sabotta, S, Scott, NJ, Seager, S, Stockdale, C, Strøm, PA, Vanderspek, R, Van Eylen, V, Wheatley, PJ, Winn, JN, Almenara, JM, Barrado, D, Barros, SCC, Bayliss, D, Bouchy, F, Boyd, PT, Cabrera, J, Cochran, WD, Demangeon, O, Doty, JP, Dumusque, X, Figueira, P, Fong, W, Grziwa, S, Hatzes, AP, Kabáth, P, Knudstrup, E, Korth, J, Livingston, JH, Luque, R, Mousis, O, Mullally, SE, Osborn, HP, Pallé, E, Persson, CM, Redfield, S, Santos, NC, Smith, J, Šubjak, J, Twicken, JD, Udry, S & Yahalomi, DA 2021, 'TOI-220 b: A warm sub-Neptune discovered by TESS', Monthly Notices of the Royal Astronomical Society, vol. 505, no. 3, pp. 3361-3379. https://doi.org/10.1093/mnras/stab1427

TY - JOUR

T1 - TOI-220 b

T2 - A warm sub-Neptune discovered by TESS

AU - Hoyer, S.

AU - Gandolfi, D.

AU - Armstrong, D. J.

AU - Deleuil, M.

AU - Acuña, L.

AU - De Medeiros, J. R.

AU - Goffo, E.

AU - Lillo-Box, J.

AU - Delgado Mena, E.

AU - Lopez, T. A.

AU - Santerne, A.

AU - Sousa, S.

AU - Fridlund, M.

AU - Adibekyan, V.

AU - Collins, K. A.

AU - Serrano, L. M.

AU - Cortés-Zuleta, P.

AU - Howell, S. B.

AU - Deeg, H.

AU - Aguichine, A.

AU - Barragán, O.

AU - Bryant, E. M.

AU - Canto Martins, B. L.

AU - Collins, K. I.

AU - Cooke, B. F.

AU - Díaz, R. F.

AU - Esposito, M.

AU - Furlan, E.

AU - Hojjatpanah, S.

AU - Jackman, J.

AU - Jenkins, J. M.

AU - Jensen, E. L.N.

AU - Latham, D. W.

AU - Leão, I. C.

AU - Matson, R. A.

AU - Nielsen, L. D.

AU - Osborn, A.

AU - Otegi, J. F.

AU - Rodler, F.

AU - Sabotta, S.

AU - Scott, N. J.

AU - Seager, S.

AU - Stockdale, C.

AU - Strøm, P. A.

AU - Vanderspek, R.

AU - Van Eylen, V.

AU - Wheatley, P. J.

AU - Winn, J. N.

AU - Almenara, J. M.

AU - Barrado, D.

AU - Barros, S. C.C.

AU - Bayliss, D.

AU - Bouchy, F.

AU - Boyd, P. T.

AU - Cabrera, J.

AU - Cochran, W. D.

AU - Demangeon, O.

AU - Doty, J. P.

AU - Dumusque, X.

AU - Figueira, P.

AU - Fong, W.

AU - Grziwa, S.

AU - Hatzes, A. P.

AU - Kabáth, P.

AU - Knudstrup, E.

AU - Korth, J.

AU - Livingston, J. H.

AU - Luque, R.

AU - Mousis, O.

AU - Mullally, S. E.

AU - Osborn, H. P.

AU - Pallé, E.

AU - Persson, C. M.

AU - Redfield, S.

AU - Santos, N. C.

AU - Smith, J.

AU - Šubjak, J.

AU - Twicken, J. D.

AU - Udry, S.

AU - Yahalomi, D. A.

PY - 2021/8/1

Y1 - 2021/8/1

N2 - In this paper, we report the discovery of TOI-220 b, a new sub-Neptune detected by the Transiting Exoplanet Survey Satellite (TESS) and confirmed by radial velocity follow-up observations with the HARPS spectrograph. Based on the combined analysis of TESS transit photometry and high precision radial velocity measurements, we estimate a planetary mass of 13.8 ± 1.0 M⊕ and radius of 3.03 ± 0.15 R⊕, implying a bulk density of 2.73 ± 0.47 g cm-3. TOI-220 b orbits a relative bright (V= 10.4) and old (10.1 ± 1.4 Gyr) K dwarf star with a period of ∼10.69 d. Thus, TOI-220 b is a new warm sub-Neptune with very precise mass and radius determinations. A Bayesian analysis of the TOI-220 b internal structure indicates that due to the strong irradiation it receives, the low density of this planet could be explained with a steam atmosphere in radiative-convective equilibrium and a supercritical water layer on top of a differentiated interior made of a silicate mantle and a small iron core.

AB - In this paper, we report the discovery of TOI-220 b, a new sub-Neptune detected by the Transiting Exoplanet Survey Satellite (TESS) and confirmed by radial velocity follow-up observations with the HARPS spectrograph. Based on the combined analysis of TESS transit photometry and high precision radial velocity measurements, we estimate a planetary mass of 13.8 ± 1.0 M⊕ and radius of 3.03 ± 0.15 R⊕, implying a bulk density of 2.73 ± 0.47 g cm-3. TOI-220 b orbits a relative bright (V= 10.4) and old (10.1 ± 1.4 Gyr) K dwarf star with a period of ∼10.69 d. Thus, TOI-220 b is a new warm sub-Neptune with very precise mass and radius determinations. A Bayesian analysis of the TOI-220 b internal structure indicates that due to the strong irradiation it receives, the low density of this planet could be explained with a steam atmosphere in radiative-convective equilibrium and a supercritical water layer on top of a differentiated interior made of a silicate mantle and a small iron core.

KW - planets and satellites: fundamental parameters

KW - planets and satellites: individual: TYC 8897-01263-1

KW - stars: fundamental parameters

KW - techniques: photometric

KW - techniques: radial velocities

UR - http://www.scopus.com/inward/record.url?scp=85115676039&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85115676039&partnerID=8YFLogxK

U2 - 10.1093/mnras/stab1427

DO - 10.1093/mnras/stab1427

M3 - Article

AN - SCOPUS:85115676039

SN - 0035-8711

VL - 505

SP - 3361

EP - 3379

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

TOI-220 b: A warm sub-Neptune discovered by TESS

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