HAT‐P‐1b: A Large‐Radius, Low‐Density Exoplanet Transiting One Member of a Stellar Binary | Zendy

G. Á. Bakos | Zendy; R. W. Noyes | Zendy; G. Kovács | Zendy; David W. Latham | Zendy; Dimitar Sasselov | Zendy; Guillermo Torres | Zendy; Debra A. Fischer | Zendy; R. P. Stefanik | Zendy; B. Sato | Zendy; John Asher Johnson | Zendy; András Pál | Zendy; Geoffrey W. Marcy | Zendy; R. Paul Butler | Zendy; Gilbert A. Esquerdo | Zendy; K. Z. Stanek | Zendy; J. Lazar | Zendy; I. Papp | Zendy; P. Sári | Zendy; Brigitta Sipőcz | Zendy

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HAT‐P‐1b: A Large‐Radius, Low‐Density Exoplanet Transiting One Member of a Stellar Binary

Author(s) -

G. Á. Bakos,

R. W. Noyes,

G. Kovács,

David W. Latham,

Dimitar Sasselov,

Guillermo Torres,

Debra A. Fischer,

R. P. Stefanik,

B. Sato,

John Asher Johnson,

András Pál,

Geoffrey W. Marcy,

R. Paul Butler,

Gilbert A. Esquerdo,

K. Z. Stanek,

J. Lazar,

I. Papp,

P. Sári,

Brigitta Sipőcz

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/509874

Subject(s) - physics , exoplanet , photometry (optics) , ephemeris , planet , radius , astronomy , astrophysics , transit (satellite) , stars , planetary system , hot jupiter , satellite , public transport , computer security , computer science , political science , law

Using small automated telescopes in Arizona and Hawaii, the HATNet projecthas detected an object transiting one member of the double star system ADS16402 AB. This system is a pair of G0 main-sequence stars with age about 3 Gyrat a distance of ~139 pc and projected separation of ~1550 AU. The transitsignal has a period of 4.46529 days and depth of 0.015 mag. From follow-upphotometry and spectroscopy, we find that the object is a "hot Jupiter" planetwith mass about 0.53 M_jup and radius ~1.36 R_jup traveling in an orbit withsemimajor axis 0.055 AU and inclination about 85.9 deg, thus transiting thestar at impact parameter 0.74 of the stellar radius. Based on a data setspanning three years, ephemerides for the transit center are: T_C = 2453984.397+ N_tr * 4.46529. The planet, designated HAT-P-1b, appears to be at least aslarge in radius, and smaller in mean density, than any previously-known planet.

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