WASP-43b: the closest-orbiting hot Jupiter

Hellier, C.; Anderson, D. R.; Cameron, A. Collier; Gillon, M.; Jehin, Emmanuël; Lendl, M.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smalley, B.; Smith, A. M. S.; Southworth, J.; Triaud, A. H. M. J.; Udry, S.; West, R. G.

doi:10.1051/0004-6361/201117081

Cited by 164 publications

(167 citation statements)

References 42 publications

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“…Radial velocity and photometric data are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/551/A80 WASP is the first gas giant around a δ Scuti ) and the population of very short period gas giants, such as WASP-12, 18, 19, and43 (Hebb et al 2009, 2010;Hellier et al 2009Hellier et al , 2011.…”

Section: Introductionmentioning

confidence: 99%

WASP-80b: a gas giant transiting a cool dwarf

Triaud

Anderson

Cameron

et al. 2013

A&A

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124

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We report the discovery of a planet transiting the star WASP-80 (1SWASP J201240.26-020838.2; 2MASS J20124017-0208391; TYC 5165-481-1; BPM 80815; V = 11.9, K = 8.4). Our analysis shows this is a 0.55 ± 0.04 M jup , 0.95 ± 0.03 R jup gas giant on a circular 3.07 day orbit around a star with a spectral type between K7V and M0V. This system produces one of the largest transit depths so far reported, making it a worthwhile target for transmission spectroscopy. We find a large discrepancy between the v sin i inferred from stellar line broadening and the observed amplitude of the Rossiter-McLaughlin effect. This can be understood either by an orbital plane nearly perpendicular to the stellar spin or by an additional, unaccounted for source of broadening.

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Section: Introductionmentioning

confidence: 99%

WASP-80b: a gas giant transiting a cool dwarf

Triaud

Anderson

Cameron

et al. 2013

A&A

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124

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“…A particularly interesting case is the WASP-43 system, consisting of a low-mass K7V-type host star and the hot Jovian planet WASP-43 b (Hellier et al 2011). Today, only a single hot Jupiter is known to orbit an even less massive star, namely, the 0.59 M M-star KOI-254 (Johnson et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Yet, with a semi-major axis of 0.015 AU, WASP-43 b remains the most closely orbiting hot Jupiter known 1 . WASP-43 b has a circular orbit and transits its host star every 0.81 d (Hellier et al 2011;Gillon et al 2012). With about the same size as Jupiter and twice its mass, it also shows twice the mean Jovian density (see Table 1).…”

Section: Introductionmentioning

confidence: 99%

“…Although WASP-43 b orbits its host star exceptionally closely, Hellier et al (2011) showed that the system geometry is not at all exceptional when it is expressed in terms of the stellar Roche radius, which is also small as a result of the low stellar mass. The same authors found that WASP-43 b orbits at 2.1 Roche radii, which is compatible with the scenario of orbital circularization after third-body interaction and, indeed, not unusual for hot Jupiters.…”

Section: Introductionmentioning

confidence: 99%

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X-ray irradiation and mass-loss of the hot Jupiter WASP-43b

Czesla

Salz

Schneider

et al. 2013

A&A

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We report the X-ray detection of the low-mass K7V star WASP-43, which is orbited by a hot Jupiter in one of the closest exoplanet orbits known to date. The high mean density of the planet implies a massive core with ≈130 M ⊕ , yielding a heavy-element massfraction of 20%. From an 18 ks long XMM-Newton observation, we derive an X-ray luminosity of 6.7 +3.5 −3.3 × 10 27 ergs s −1 , which puts WASP-43 among the active K-stars, which is compatible with its relatively young age derived in previous studies. The X-ray luminosity translates into a soft X-ray flux of (10.2 ± 5.4) × 10 3 erg cm −2 s −1 at the substellar point. According to our modeling, the combined X-ray and extreme ultraviolet flux may trigger mass-loss at a rate of up to ≈10 12 g s −1 via energy-limited atmospheric escape. We infer that it is unlikely that the planet has lost more than 2.5% of its current mass through that channel and that activityinduced mass-loss has not substantially altered its evolution.

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“…Due to the host star's cool temperature and small radius, as well as a small semimajor axis, the system produces deep eclipses both in transit and occultation, making WASP-43b one of the most observed and studied exoplanets today. Multiple photometric and spectroscopic observations of WASP-43b (Hellier et al 2011;Gillon et al 2012;Wang et al 2013;Blecic et al 2014;Chen et al 2014;Stevenson et al 2014b;Zhou et al 2014) revealed no thermal inversion in the planetary atmosphere, low day-night energy redistribution, water abundance 1-10× solar, and a slightly enhanced C/O ratio compared to solar (Benneke 2015;J. Blecic et al 2016).…”

Section: Background Of the Models Usedmentioning

confidence: 99%

Tea: A Code Calculating Thermochemical Equilibrium Abundances

Blecic

Harrington

Bowman

2016

ApJS

100

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We present an open-source Thermochemical Equilibrium Abundances (TEA) code that calculates the abundances of gaseous molecular species. The code is based on the methodology of White et al. and Eriksson. It applies Gibbs free-energy minimization using an iterative, Lagrangian optimization scheme. Given elemental abundances, TEA calculates molecular abundances for a particular temperature and pressure or a list of temperature-pressure pairs. We tested the code against the method of Burrows & Sharp, the free thermochemical equilibrium code Chemical Equilibrium with Applications (CEA), and the example given by Burrows & Sharp. Using their thermodynamic data, TEA reproduces their final abundances, but with higher precision. We also applied the TEA abundance calculations to models of several hot-Jupiter exoplanets, producing expected results. TEA is written in Python in a modular format. There is a start guide, a user manual, and a code document in addition to this theory paper. TEA is available under a reproducible-research, open-source license via https://github.com/dzesmin/TEA.

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WASP-43b: the closest-orbiting hot Jupiter

Cited by 164 publications

References 42 publications

WASP-80b: a gas giant transiting a cool dwarf

WASP-80b: a gas giant transiting a cool dwarf

X-ray irradiation and mass-loss of the hot Jupiter WASP-43b

Tea: A Code Calculating Thermochemical Equilibrium Abundances

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