K2-29 b/WASP-152 b: AN ALIGNED AND INFLATED HOT JUPITER IN A YOUNG VISUAL BINARY

A. Santerne (1) , G. Hébrard (2) , J. Lillo-Box , D. J. Armstrong , S. C. C. Barros (3) , O. Demangeon (4, 5) , D. Barrado (6, 7) , A. Debackere , M. Deleuil (8) , E. Delgado Mena , M. Montalto , D. Pollacco , H. P. Osborn , S. G. Sousa , L. Abe (9) , V. Adibekyan (1) , J. -M. Almenara (10) , P. André (11) , G. Arlic , G. Barthe , P. Bendjoya (12) , R. Behrend (13, 14) , I. Boisse (8) , F. Bouchy (15, 2) , H. Boussier , M. Bretton , D. J. A. Brown , B. Carry (16) , A. Cailleau , E. Conseil , G. Coulon , B. Courcol , B. Dauchet , J. -C. Dalouzy , M. Deldem , O. Desormieres , P. Dubreuil , J. -M. Fehrenbach , S. Ferratfiat , R. Girelli , J. Gregorio , S. Jaecques , F. Kugel (17) , J. Kirk (18) , O. Labrevoir , J. -C. Lachurie , K. W. F. Lam , P. Le Guen (19) , Pedro Martinez , L. P. A. Maurin , J. Mccormac , J-B. Pioppa , U. Quadri , A. Rajpurohit , J. Rey (20) , J. -P. Rivet , R. Roy (21) , N. C. Santos (1, 22) , F. Signoret , L. Strabla , O. Suarez , D. Toublanc (23) , M. Tsantaki , J. -M. Vienney , P. A. Wilson , M. Bachschmidt , Florent Colas (16) , O. Gerteis , P. Louis , J. -C. Mario , C. Marlot (24) , J. Montier , V. Perroud , V. Pic , D. Romeuf (25) , S. Ubaud , D. Verilhac

1 CAUP - Centro de Astrofísica da Universidade do Porto
2 IAP - Institut d'Astrophysique de Paris
3 Virologia
4 UP11 - Université Paris-Sud - Paris 11
5 IAS - Institut d'astrophysique spatiale
6 Departamento de Astrofisica [Madrid]
7 Calar Alto Observatory
8 LAM - Laboratoire d'Astrophysique de Marseille
9 LAGRANGE - Joseph Louis LAGRANGE
10 IAC - Instituto de Astrofisica de Canarias
11 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
12 COMUE UCA - COMUE Université Côte d'Azur (2015-2019)
13 Geneva Observatory
14 CdR & CdL group
15 OHP - Observatoire de Haute-Provence
16 IMCCE - Institut de Mécanique Céleste et de Calcul des Ephémérides
17 Observatoire Chante-Perdrix
18 School of Physics and Astronomy [Cardiff]
19 HEGP - Hôpital Européen Georges Pompidou [APHP]
20 DRCP - Département RadioChimie et Procédés
21 ULaval - Université Laval [Québec]
22 DFA/FCUP - Departamento de Física e Astronomia [Porto]
23 CESR - Centre d'étude spatiale des rayonnements
24 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
25 CdR & CdL group - Courbes de rotation d'astéroïdes, de comètes et d'étoiles variables

In the present paper we report the discovery of a new hot Jupiter, K2-29 b, first detected by the Super-WASP observatory and then by the K2 space mission during its campaign 4. The planet has a period of 3.25 days, a mass of 0.73 +/- 0.04M(sic), and a radius of 1.19 +/- 0.02 R(sic). The host star is a relatively bright (V = 12.5) G7 dwarf with a nearby K5V companion. Based on stellar rotation and the abundance of lithium, we find that the system might be as young as similar to 450 Myr. The observation of the Rossiter-McLaughlin effect shows that the planet is aligned with respect to the stellar spin. Given the deep transit (20 mmag), the magnitude of the star and the presence of a nearby stellar companion, the planet is a good target for both space- and ground-based transmission spectroscopy, in particular in the near-infrared where both stars are relatively bright.

Domains: Astrophysics [astro-ph]

A. Santerne, G. Hébrard, J. Lillo-Box, D. J. Armstrong, S. C. C. Barros, et al.. K2-29 b/WASP-152 b: AN ALIGNED AND INFLATED HOT JUPITER IN A YOUNG VISUAL BINARY. The Astrophysical Journal, 2016, 824 (1), ⟨10.3847/0004-637X/824/1/55⟩. ⟨hal-01440104⟩