Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops

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.; Hooton, M.J.; Latham, D.W.; Lendl, M.; Matthews, E.C.; Tuson, A.; Ulmer-Moll, S.; Vanderburg, A.; Wilson, T.G.; Ziegler, C.; Alibert, Y.; Alonso, R.; Anglada, G.; Arnold, L.; Asquier, J.; y, Navascues, D.B.; Baumjohann, W.; Beck, T.; Belinski, A.A.; Benz, W.; Biondi, F.; Boisse, I.; Bonfils, X.; Broeg, C.; Buchhave, L.A.; Bárczy, T.; Barros, S.C.C.; Cabrera, J.; Guillen, C.C.; Carleo, I.; Castro-González, A.; Charnoz, S.; Christiansen, J.; Cortes-Zuleta, P.; Csizmadia, S.; Dalal, S.; Davies, M.B.; Deleuil, M.; Delfosse, X.; Delrez, L.; Demory, B.-O.; Dunlavey, A.B.; Ehrenreich, D.; Erikson, A.; Fernandes, R.B.; Fortier, A.; Forveille, T.; Fossati, L.; Fridlund, M.; Gillon, M.; Goeke, R.F.; Goliguzova, M.V.; Gonzales, E.J.; Günther, M.N.; Güdel, M.; Heidari, N.; Henze, C.E.; Howell, S.; Hoyer, S.; Frey, J.I.; Isaak, K.G.; Jenkins, J.M.; Kiefer, F.; Kiss, L.; Korth, J.; Maxted, P.F.L.; Laskar, J.; des, Etangs, A.L.; Lovis, C.; Lund, M.B.; Luque, R.; Magrin, D.; Almenara, J.M.; Martioli, E.; Mecina, M.; Medina, J.V.; Moldovan, D.; Morales-Calderón, M.; Morello, G.; Moutou, C.; Murgas, F.; Jensen, E.L.N.; 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, O.D.S.; Smith, A.M.S.; Santos, N.; Scandariato, G.; Seager, S.; Sousa, S.G.; Steller, M.; Szabó, G.M.; Ségransan, D.; Thomas, N.; Udry, S.; Ulmer, B.; Van Grootel, V.; Vanderspek, R.; Walton, N.; Winn, J.N.

Name:

stad1319.pdf

Size:

8.567Mb

Format:

PDF

Description:

Final Published Version

Download

Author

Osborn, H.P.
Nowak, G.
Hébrard, G.
Masseron, T.
Lillo-Box, J.
Pallé, E.
Bekkelien, A.
Florén, H.-G.
Guterman, P.
Simon, A.E.

Show all

Affiliation

Lunar and Planetary Laboratory, The University of Arizona

Issue Date

2023-06-08

Citation

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, Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops, Monthly Notices of the Royal Astronomical Society, Volume 523, Issue 2, August 2023, Pages 3069–3089, https://doi.org/10.1093/mnras/stad1319

Journal

Monthly Notices of the Royal Astronomical Society

Rights

Collection Information

This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.

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. © 2023 The Author(s).

Note

Immediate access

ISSN

0035-8711

DOI

10.1093/mnras/stad1319

Version

Final Published Version

Collections

UA Faculty Publications