EPIC211089792 b: an aligned and inflated hot jupiter in a young visual binary

In the present paper we report the discovery of a new hot Jupiter, EPIC211089792 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 3.25d, a mass of 0.73 +/- 0.04 Mjup, and a radius of 1.19 +/- 0.02 Rjup. The host star i...

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Published in:arXiv.org 2016-01
Main Authors: Santerne, A, Hébrard, G, Lillo-Box, J, Armstrong, D J, Barros, S C C, Demangeon, O, Barrado, D, Debackere, A, Deleuil, M, E Delgado Mena, Montalto, M, Pollacco, D, Osborn, H P, Sousa, S G, Abe, L, Adibekyan, V, J -M Almenara, André, P, Arlic, G, Barthe, G, Bendjoya, P, Behrend, R, Boisse, I, Bouchy, F, Boussier, H, Bretton, M, Brown, D J A, Carry, B, Cailleau, A, Conseil, E, Courcol, B, Dauchet, B, J -C Dalouzy, Deldem, M, Dubreuil, P, J -M Fehrenbach, Ferratfiat, S, Girelli, R, Gregorio, J, Jaecques, S, Kugel, F, Kirk, J, Labrevoir, O, J -C Lachurié, Lam, K W F, P Le Guen, Martinez, P, Maurin, L, McCormac, J, J-B Pioppa, Quadri, U, Rajpurohit, A, Rey, J, J -P Rivet, Roy, R, Santos, N C, Signoret, F, Strabla, L, Suarez, O, Toublanc, D, Tsantaki, M, Wilson, P A, Bachschmidt, M, Colas, F, Gerteis, O, Louis, P, J -C Mario, Marlot, C, Montier, J, Perroud, V, Pic, V, Romeuf, D, Ubaud, S, Verilhac, D
Format: Article
Language:English
Subjects:
Binary stars
Extrasolar planets
Gas giant planets
Lithium
Stellar rotation
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Summary:In the present paper we report the discovery of a new hot Jupiter, EPIC211089792 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 3.25d, a mass of 0.73 +/- 0.04 Mjup, and a radius of 1.19 +/- 0.02 Rjup. 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 about 450 Myr. The observation of the Rossiter-McLaughlin effect shows the planet is aligned with respect to the stellar spin. Given the deep transit (20mmag), 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 the both stars are relatively bright.
ISSN:2331-8422
DOI:10.48550/arxiv.1601.07680