TESS and CHEOPS discover two warm sub-Neptunes transiting the bright K-dwarf HD 15906
- Tuson, A.
- Queloz, D.
- Osborn, H. P.
- Wilson, T.G.
- Hooton, M.J.
- Beck, M.
- Lendl, M.
- Olofsson, G.
- Fortier, A.
- Bonfanti, A.
- Brandeker, A.
- Buchhave, L. A.
- Collier Cameron, A.
- Ciardi, D. R.
- Collins, K. A.
- Gandolfi, D.
- Garai, Z.
- Giacalone, S.
- da Silva, J. Gomes
- Howell, S. B.
- Patel, J. A.
- Persson, Carina
- Serrano, L. M.
- Sousa, S. G.
- Ulmer-Moll, S.
- Vanderburg, A.
- Ziegler, C.
- Alibert, Y.
- Alonso, R.
- Anglada, G.
- B\ue1rczy, T.
- Navascues, D. Barrado
- Barros, S.C.C.
- Baumjohann, W.
- Beck, T.
- Benz, W.
- Billot, N.
- Bonfils, X.
- Borsato, L.
- Broeg, C.
- Cabrera, J.
- Charnoz, S.
- Conti, D.
- Csizmadia, Szilard
- Cubillos, P. E.
- Davies, M. B.
- Deleuil, M.
- Delrez, L.
- Demangeon, O.
- Demory, B.O.
- Dragomir, D.
- Dressing, Courtney D.
- Ehrenreich, D.
- Erikson, Anders
- Essack, Zahra
- Farinato, J.
- Fossati, L.
- Fridlund, Malcolm
- Furlan, Elise
- Gill, H.
- Gillon, Micha\uebl
- Gnilka, Crystal
- Gonzales, E.
- Gudel, M.
- G\ufcnther, Maximilian N.
- Hoyer, S.
- Isaak, K.
- Jenkins, Jon M.
- Kiss, L.L.
- Laskar, J.
- Latham, D. W.
- Law, N.
- des Etangs, A. L.
- Curto, G. Lo
- Lovis, C.
- Luque, R.
- Magrin, D.
- Mann, A.
- Maxted, P.
- Mayor, Michel
- McDermott, S.
- Mecina, M.
- Mordasini, C.
- Mortier, A.
- Nascimbeni, Valerio
- Ottensamer, R.
- Pagano, I.
- Palle, E.
- Peter, G.
- Piotto, Giampaolo P.
- Pollacco, D.
- Pritchard, T.
- Ragazzoni, Roberto
- Rando, N.
- Ratti, F.
- Rauer, H.
- Ribas, I.
- Ricker, George R.
- Rieder, M.
- Santos, N. C.
DOIAbstract
We report the discovery of two warm sub-Neptunes transiting the bright (G = 9.5 mag) K-dwarf HD 15906 (TOI 461, TIC 4646810). This star was observed by the Transiting Exoplanet Survey Satellite (TESS) in sectors 4 and 31, revealing two small transiting planets. The inner planet, HD 15906 b, was detected with an unambiguous period but the outer planet, HD 15906 c, showed only two transits separated by ∼ 734 d, leading to 36 possible values of its period. We performed follow-up observations with the CHaracterising ExOPlanet Satellite (CHEOPS) to confirm the true period of HD 15906 c and improve the radius precision of the two planets. From TESS, CHEOPS, and additional ground-based photometry, we find that HD 15906 b has a radius of 2.24 \ub1 ...
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