An extremely low-density and temperate giant exoplanet

A. Santerne; L. Malavolta; M. R. Kosiarek; F. Dai; C. D. Dressing; X. Dumusque; N. C. Hara; T. A. Lopez; A. Mortier; A. Vanderburg; V. Adibekyan; D. J. Armstrong; D. Barrado; S. C. C. Barros; D. Bayliss; D. Berardo; I. Boisse; A. S. Bonomo; F. Bouchy; D. J. A. Brown; L. A. Buchhave; R. P. Butler; A. Collier Cameron; R. Cosentino; J. D. Crane; I. J. M. Crossfield; M. Damasso; M. R. Deleuil; E. Delgado Mena; O. Demangeon; R. F. Diaz; J. -F. Donati; P. Figueira; B. J. Fulton; A. Ghedina; A. Harutyunyan; G. Hébrard; L. A. Hirsch; S. Hojjatpanah; A. W. Howard; H. Isaacson; D. W. Latham; J. Lillo-Box; M. López-Morales; C. Lovis; A. F. Martinez Fiorenzano; E. Molinari; O. Mousis; C. Moutou; C. Nava; L. D. Nielsen; H. P. Osborn; E. A. Petigura; D. F. Phillips; D. L. Pollacco; E. Poretti; K. Rice; N. C. Santos; D. Ségransan; S. A. Shectman; E. Sinukoff; S. G. Sousa; A. Sozzetti; J. K. Teske; S. Udry; A. Vigan; S. X. Wang; C. A. Watson; L. M. Weiss; P. J. Wheatley; J. N. Winn

An extremely low-density and temperate giant exoplanet

A. Santerne, L. Malavolta, M. R. Kosiarek, F. Dai, C. D. Dressing, X. Dumusque, N. C. Hara, T. A. Lopez, A. Mortier, A. Vanderburg, V. Adibekyan, D. J. Armstrong, D. Barrado, S. C. C. Barros, D. Bayliss, D. Berardo, I. Boisse, A. S. Bonomo, F. Bouchy, D. J. A. BrownL. A. Buchhave, R. P. Butler, A. Collier Cameron, R. Cosentino, J. D. Crane, I. J. M. Crossfield, M. Damasso, M. R. Deleuil, E. Delgado Mena, O. Demangeon, R. F. Diaz, J. -F. Donati, P. Figueira, B. J. Fulton, A. Ghedina, A. Harutyunyan, G. Hébrard, L. A. Hirsch, S. Hojjatpanah, A. W. Howard, H. Isaacson, D. W. Latham, J. Lillo-Box, M. López-Morales, C. Lovis, A. F. Martinez Fiorenzano, E. Molinari, O. Mousis, C. Moutou, C. Nava, L. D. Nielsen, H. P. Osborn, E. A. Petigura, D. F. Phillips, D. L. Pollacco, E. Poretti, K. Rice, N. C. Santos, D. Ségransan, S. A. Shectman, E. Sinukoff, S. G. Sousa, A. Sozzetti, J. K. Teske, S. Udry, A. Vigan, S. X. Wang, C. A. Watson, L. M. Weiss, P. J. Wheatley, J. N. Winn

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Abstract

Transiting extrasolar planets are key objects in the study of the formation, migration, and evolution of planetary systems. In particular, the exploration of the atmospheres of giant planets, through transmission spectroscopy or direct imaging, has revealed a large diversity in their chemical composition and physical properties. Studying these giant planets allows one to test the global climate models that are used for the Earth and other solar system planets. However, these studies are mostly limited either to highly-irradiated transiting giant planets or directly-imaged giant planets at large separations. Here we report the physical characterisation of the planets in a bright multi-planetary system (HIP41378) in which the outer planet, HIP41378 f is a Saturn-sized planet (9.2 ± 0.1 R⊕) with an anomalously low density of 0.09 ± 0.02 g cm−3 that is not yet understood. Its equilibrium temperature is about 300 K. Therefore, it represents a planet with a mild temperature, in between the hot Jupiters and the colder giant planets of the Solar System. It opens a new window for atmospheric characterisation of giant exoplanets with a moderate irradiation, with the next-generation space telescopes such as JWST and ARIEL as well as the extremely-large ground-based telescopes. HIP41378 f is thus an important laboratory to understand the effect of the irradiation on the physical properties and chemical composition of the atmosphere of planets.

Original language	English
Journal	Nature Astronomy
ISSN	2397-3366
Publication status	Submitted - 2023

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https://arxiv.org/abs/1911.07355

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Santerne, A., Malavolta, L., Kosiarek, M. R., Dai, F., Dressing, C. D., Dumusque, X., Hara, N. C., Lopez, T. A., Mortier, A., Vanderburg, A., Adibekyan, V., Armstrong, D. J., Barrado, D., Barros, S. C. C., Bayliss, D., Berardo, D., Boisse, I., Bonomo, A. S., Bouchy, F., ... Winn, J. N. (2023). An extremely low-density and temperate giant exoplanet. Manuscript submitted for publication. https://arxiv.org/abs/1911.07355

@article{a41902a33b6346da85f80a791d368316,

title = "An extremely low-density and temperate giant exoplanet",

abstract = "Transiting extrasolar planets are key objects in the study of the formation, migration, and evolution of planetary systems. In particular, the exploration of the atmospheres of giant planets, through transmission spectroscopy or direct imaging, has revealed a large diversity in their chemical composition and physical properties. Studying these giant planets allows one to test the global climate models that are used for the Earth and other solar system planets. However, these studies are mostly limited either to highly-irradiated transiting giant planets or directly-imaged giant planets at large separations. Here we report the physical characterisation of the planets in a bright multi-planetary system (HIP41378) in which the outer planet, HIP41378 f is a Saturn-sized planet (9.2 ± 0.1 R⊕) with an anomalously low density of 0.09 ± 0.02 g cm−3 that is not yet understood. Its equilibrium temperature is about 300 K. Therefore, it represents a planet with a mild temperature, in between the hot Jupiters and the colder giant planets of the Solar System. It opens a new window for atmospheric characterisation of giant exoplanets with a moderate irradiation, with the next-generation space telescopes such as JWST and ARIEL as well as the extremely-large ground-based telescopes. HIP41378 f is thus an important laboratory to understand the effect of the irradiation on the physical properties and chemical composition of the atmosphere of planets. ",

author = "A. Santerne and L. Malavolta and Kosiarek, {M. R.} and F. Dai and Dressing, {C. D.} and X. Dumusque and Hara, {N. C.} and Lopez, {T. A.} and A. Mortier and A. Vanderburg and V. Adibekyan and Armstrong, {D. J.} and D. Barrado and Barros, {S. C. C.} and D. Bayliss and D. Berardo and I. Boisse and Bonomo, {A. S.} and F. Bouchy and Brown, {D. J. A.} and Buchhave, {L. A.} and Butler, {R. P.} and {Collier Cameron}, A. and R. Cosentino and Crane, {J. D.} and Crossfield, {I. J. M.} and M. Damasso and Deleuil, {M. R.} and {Delgado Mena}, E. and O. Demangeon and Diaz, {R. F.} and Donati, {J. -F.} and P. Figueira and Fulton, {B. J.} and A. Ghedina and A. Harutyunyan and G. H{\'e}brard and Hirsch, {L. A.} and S. Hojjatpanah and Howard, {A. W.} and H. Isaacson and Latham, {D. W.} and J. Lillo-Box and M. L{\'o}pez-Morales and C. Lovis and {Martinez Fiorenzano}, {A. F.} and E. Molinari and O. Mousis and C. Moutou and C. Nava and Nielsen, {L. D.} and Osborn, {H. P.} and Petigura, {E. A.} and Phillips, {D. F.} and Pollacco, {D. L.} and E. Poretti and K. Rice and Santos, {N. C.} and D. S{\'e}gransan and Shectman, {S. A.} and E. Sinukoff and Sousa, {S. G.} and A. Sozzetti and Teske, {J. K.} and S. Udry and A. Vigan and Wang, {S. X.} and Watson, {C. A.} and Weiss, {L. M.} and Wheatley, {P. J.} and Winn, {J. N.}",

year = "2023",

language = "English",

journal = "Nature Astronomy",

issn = "2397-3366",

publisher = "Nature Publishing Group",

}

Santerne, A, Malavolta, L, Kosiarek, MR, Dai, F, Dressing, CD, Dumusque, X, Hara, NC, Lopez, TA, Mortier, A, Vanderburg, A, Adibekyan, V, Armstrong, DJ, Barrado, D, Barros, SCC, Bayliss, D, Berardo, D, Boisse, I, Bonomo, AS, Bouchy, F, Brown, DJA, Buchhave, LA, Butler, RP, Collier Cameron, A, Cosentino, R, Crane, JD, Crossfield, IJM, Damasso, M, Deleuil, MR, Delgado Mena, E, Demangeon, O, Diaz, RF, Donati, J-F, Figueira, P, Fulton, BJ, Ghedina, A, Harutyunyan, A, Hébrard, G, Hirsch, LA, Hojjatpanah, S, Howard, AW, Isaacson, H, Latham, DW, Lillo-Box, J, López-Morales, M, Lovis, C, Martinez Fiorenzano, AF, Molinari, E, Mousis, O, Moutou, C, Nava, C, Nielsen, LD, Osborn, HP, Petigura, EA, Phillips, DF, Pollacco, DL, Poretti, E, Rice, K, Santos, NC, Ségransan, D, Shectman, SA, Sinukoff, E, Sousa, SG, Sozzetti, A, Teske, JK, Udry, S, Vigan, A, Wang, SX, Watson, CA, Weiss, LM, Wheatley, PJ & Winn, JN 2023, 'An extremely low-density and temperate giant exoplanet', Nature Astronomy. <https://arxiv.org/abs/1911.07355>

TY - JOUR

T1 - An extremely low-density and temperate giant exoplanet

AU - Santerne, A.

AU - Malavolta, L.

AU - Kosiarek, M. R.

AU - Dai, F.

AU - Dressing, C. D.

AU - Dumusque, X.

AU - Hara, N. C.

AU - Lopez, T. A.

AU - Mortier, A.

AU - Vanderburg, A.

AU - Adibekyan, V.

AU - Armstrong, D. J.

AU - Barrado, D.

AU - Barros, S. C. C.

AU - Bayliss, D.

AU - Berardo, D.

AU - Boisse, I.

AU - Bonomo, A. S.

AU - Bouchy, F.

AU - Brown, D. J. A.

AU - Buchhave, L. A.

AU - Butler, R. P.

AU - Collier Cameron, A.

AU - Cosentino, R.

AU - Crane, J. D.

AU - Crossfield, I. J. M.

AU - Damasso, M.

AU - Deleuil, M. R.

AU - Delgado Mena, E.

AU - Demangeon, O.

AU - Diaz, R. F.

AU - Donati, J. -F.

AU - Figueira, P.

AU - Fulton, B. J.

AU - Ghedina, A.

AU - Harutyunyan, A.

AU - Hébrard, G.

AU - Hirsch, L. A.

AU - Hojjatpanah, S.

AU - Howard, A. W.

AU - Isaacson, H.

AU - Latham, D. W.

AU - Lillo-Box, J.

AU - López-Morales, M.

AU - Lovis, C.

AU - Martinez Fiorenzano, A. F.

AU - Molinari, E.

AU - Mousis, O.

AU - Moutou, C.

AU - Nava, C.

AU - Nielsen, L. D.

AU - Osborn, H. P.

AU - Petigura, E. A.

AU - Phillips, D. F.

AU - Pollacco, D. L.

AU - Poretti, E.

AU - Rice, K.

AU - Santos, N. C.

AU - Ségransan, D.

AU - Shectman, S. A.

AU - Sinukoff, E.

AU - Sousa, S. G.

AU - Sozzetti, A.

AU - Teske, J. K.

AU - Udry, S.

AU - Vigan, A.

AU - Wang, S. X.

AU - Watson, C. A.

AU - Weiss, L. M.

AU - Wheatley, P. J.

AU - Winn, J. N.

PY - 2023

Y1 - 2023

N2 - Transiting extrasolar planets are key objects in the study of the formation, migration, and evolution of planetary systems. In particular, the exploration of the atmospheres of giant planets, through transmission spectroscopy or direct imaging, has revealed a large diversity in their chemical composition and physical properties. Studying these giant planets allows one to test the global climate models that are used for the Earth and other solar system planets. However, these studies are mostly limited either to highly-irradiated transiting giant planets or directly-imaged giant planets at large separations. Here we report the physical characterisation of the planets in a bright multi-planetary system (HIP41378) in which the outer planet, HIP41378 f is a Saturn-sized planet (9.2 ± 0.1 R⊕) with an anomalously low density of 0.09 ± 0.02 g cm−3 that is not yet understood. Its equilibrium temperature is about 300 K. Therefore, it represents a planet with a mild temperature, in between the hot Jupiters and the colder giant planets of the Solar System. It opens a new window for atmospheric characterisation of giant exoplanets with a moderate irradiation, with the next-generation space telescopes such as JWST and ARIEL as well as the extremely-large ground-based telescopes. HIP41378 f is thus an important laboratory to understand the effect of the irradiation on the physical properties and chemical composition of the atmosphere of planets.

AB - Transiting extrasolar planets are key objects in the study of the formation, migration, and evolution of planetary systems. In particular, the exploration of the atmospheres of giant planets, through transmission spectroscopy or direct imaging, has revealed a large diversity in their chemical composition and physical properties. Studying these giant planets allows one to test the global climate models that are used for the Earth and other solar system planets. However, these studies are mostly limited either to highly-irradiated transiting giant planets or directly-imaged giant planets at large separations. Here we report the physical characterisation of the planets in a bright multi-planetary system (HIP41378) in which the outer planet, HIP41378 f is a Saturn-sized planet (9.2 ± 0.1 R⊕) with an anomalously low density of 0.09 ± 0.02 g cm−3 that is not yet understood. Its equilibrium temperature is about 300 K. Therefore, it represents a planet with a mild temperature, in between the hot Jupiters and the colder giant planets of the Solar System. It opens a new window for atmospheric characterisation of giant exoplanets with a moderate irradiation, with the next-generation space telescopes such as JWST and ARIEL as well as the extremely-large ground-based telescopes. HIP41378 f is thus an important laboratory to understand the effect of the irradiation on the physical properties and chemical composition of the atmosphere of planets.

M3 - Journal article

JO - Nature Astronomy

JF - Nature Astronomy

SN - 2397-3366

ER -

An extremely low-density and temperate giant exoplanet

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