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

By Gáspár Á. Bakos, R. W. Noyes, G. Kovacs, D. Latham, D. Sasselov, G. Torres, Debra A. Fischer, R. Stefanik, Bun'ei Sato, John A. Johnson and 18 more. 2006

208 citations recorded by the source corpus.

Using small automated telescopes in Arizona and Hawaii, the HATNet project has detected an object transiting one member of the double star system ADS 16402. This system is a pair of G0 main-sequence stars with age about 3 Gyr at a distance of ~139 pc and projected separation of ~1550 AU. The transit signal has a period of 4.46529 days and depth of 0.015 mag. From follow-up photometry and spectroscopy, we find that the object is a "hot Jupiter" planet with mass about 0.53MJ and radius ~1.36RJ traveling in an orbit with semimajor axis 0.055 AU and inclination about 85.9°, thus transiting the star at impact parameter 0.74 of the stellar radius. Based on a data set spanning 3 yr, ephemerides for the transit center are TC = 2453984.397 + Ntr × 4.46529. The planet, designated HAT-P-1b, appears to be at least as large in radius, and smaller in mean density, than any previously known planet.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/f6cd9a11676e0dc270c175d50eb2a96abb62aeee

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Jon Fortney
2. D. Charbonneau
3. N. Madhusudhan
4. J. Southworth
5. Sara Seager
6. J. Winn
7. A. Showman
8. H. Knutson

In Instrumentation

1. Jon Fortney
2. J. Southworth
3. D. Charbonneau
4. J. Winn
5. A. Showman
6. Sara Seager
7. H. Knutson
8. D. Sing

Citations in the corpus

• THE FREQUENCY OF HOT JUPITERS ORBITING NEARBY SOLAR-TYPE STARS (2012, background): “…Johnson et al. 2007), high metallicity stars (N2K; Fischer et al. 2005), active stars, SIM reference stars, Kepler targets, systems discovered by transit (e.g. the HATNet targets; Bakos et al. 2007), planetary systems discovered by radial velocities (RVs) by other groups, and many other purposes.”
• Tidal Heating of Extrasolar Planets (2008, background): “HAT-P-1b is also larger than predicted by theory (Bakos et al. 2007a).”
• Possible Solutions to the Radius Anomalies of Transiting Giant Planets (2006, background): “…theorists alike have focused on the apparent discrepancy with published theory of the transit radii of some EGPs, notably HD 209458b, HAT-P-1b, and WASP-1b (Knutson et al. 2007; Bakos et al. 2007; Charbonneau et al. 2007b), i.e., that these close-in EGPs are larger than most theories would predict.”
• Debris Disks in Main-Sequence Binary Systems (2006, background): “Some older binary systems also offer evidence of planetary system formation, with both planets (Patience et al. 2002; Eggenberger et al. 2004; Konacki 2005; Bakos et al. 2007) and debris disks (Aumann 1985; Patten & Willson 1991; Koerner et al. 2000; Prato et al. 2001) known.”
• The 3.6-8.0 μm Broadband Emission Spectrum of HD 209458b: Evidence for an Atmospheric Temperature Inversion (2007, background): “The planet HATP-1b (Bakos et al. 2007a) was initially thought to share this property as well, but subsequent observations (Winn et al. 2007) revealed that its radius was smaller than initially estimated.”
• Tidal Evolution of Close-in Extrasolar Planets (2007, background): “Planetary data were taken from a variety of sources: Bakos et al. 2007a; Bakos et al. 2007b; Butler et al. 2006; Da Silva et al. 2006; Deming et al. 2007; Gillon et al. 2007; Johnson et al. 2006; Knutson et al. 2007; Laughlin et al. 2005; Lovis et al. 2006; McArthur et al. 2004; Maness 2007; Mayor…”
• TAU-REX I: A NEXT GENERATION RETRIEVAL CODE FOR EXOPLANETARY ATMOSPHERES (2014, unknown): “MCMC routines are commonly used in the field of extrasolar planets (e.g. Ford 2006; Burke et al. 2010; Bakos et al. 2007; Knutson et al. 2007; Cameron et al. 2007; Charbonneau et al. 2009; Bean et al. 2010; Kipping & Bakos 2011; Gregory 2011; Crouzet et al. 2012; Kreidberg et al. 2014).”
• Hubble Space Telescope hot Jupiter transmission spectral survey: a detection of Na and strong optical absorption in HAT-P-1b (2013, methodology): “Detected by the small automated telescopes of the HATNet ground-based transit survey, (Bakos et al. 2007) HAT-P-1b is a giant (Rp ∼ 1.2 RJ), low-mean density (ρp ∼ 0.4 gcm−3) transiting extrasolar planet in a visual binary system, composed of two sun-like stars (separated by angular distance of…”
• The Kilodegree Extremely Little Telescope (KELT): A Small Robotic Telescope for Large‐Area Synoptic Surveys (2007, background): “These surveys have so far discovered six planets transiting bright stars (Alonso et al. 2004; Bakos et al. 2007; Cameron et al. 2007; McCullough et al. 2006; O’Donovan et al. 2006).”
• DISCOVERY OF A TRANSITING PLANET AND EIGHT ECLIPSING BINARIES IN HATNet FIELD G205 (2009, background): “Subsequent follow-up observations showed that HTR205-023 is the star hosting a transiting planet (Bakos et al. 2007b), not HTR205022.”
• The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733 (2006, methodology): “In combination with our eight data points, we fitted a linear function of transit epoch E, Tc(E ) ¼ Tc(0)þ EP; ð5Þ finding Tc(0) ¼ 2; 453; 988:80336(23) (HJD) and P ¼ 2:2185733(19) days, where the numbers in parentheses indicate14 While Bakos et al. (2007) did fit for the stellar radius, finding R?”
• LOW FALSE POSITIVE RATE OF KEPLER CANDIDATES ESTIMATED FROM A COMBINATION OF SPITZER AND FOLLOW-UP OBSERVATIONS (2015, background): “During the last decade, ground-based surveys dedicated to the search of transiting planets have spent considerable effort in confirming the planetary nature of photometrically detected candidates (Alonso et al. 2004; Bakos et al. 2007; Collier Cameron et al. 2007; Moutou et al. 2009).”
• Efficient identification of exoplanetary transit candidates from SuperWASP light curves (2007, background): “…smallaperture camera lenses and large-format CCDs have yielded several discoveries of new transiting extrasolar planets (Alonso et al. 2004; McCullough et al. 2006; O’Donovan et al. 2006; Collier Cameron et al. 2007; Bakos et al. 2007a; Bakos et al. 2007b; Burke et al. 2007; O’Donovan et al. 2007).”