The TROY project

Lillo-Box, J.; Leleu, Adrien; Parviainen, H.; Figueira, P.; Mallonn, M.; Correia, A. C. M.; Santos, N. C.; Robutel, Philippe; Lendl, M.; Boffin, H. M. J.; Faria, J. P.; Barrado, D.; Neal, J. J.

doi:10.1051/0004-6361/201833312

Cited by 26 publications

(10 citation statements)

References 55 publications

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“…The Exoplanet Transit Database performs a transit fit to the uploaded light curves (Poddaný et al 2010). The achieved best fit parameters are listed on the webpage and are regularly used in scientific publications (e.g., Southworth et al 2016;Angerhausen et al 2017;Lillo-Box et al 2018). Our reanalyzed timing values of 85 ETD light curves allow for a cross check with these ETD results.…”

Section: Comparison To the Etd Online Fit Resultsmentioning

confidence: 99%

Ephemeris refinement of 21 hot Jupiter exoplanets with high timing uncertainties

Mallonn

Essen

Herrero

et al. 2019

A&A

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Transit events of extrasolar planets offer a wealth of information for planetary characterization. However, for many known targets, the uncertainty of their predicted transit windows prohibits an accurate scheduling of follow-up observations. In this work, we refine the ephemerides of 21 hot Jupiter exoplanets with the largest timing uncertainties. We collected 120 professional and amateur transit light curves of the targets of interest, observed with a range of telescopes of 0.3m to 2.2m, and analyzed them along with the timing information of the planets discovery papers. In the case of WASP-117b, we measured a timing deviation compared to the known ephemeris of about 3.5 hours, and for HAT-P-29b and HAT-P-31b the deviation amounted to about 2 hours and more. For all targets, the new ephemeris predicts transit timings with uncertainties of less than 6 minutes in the year 2018 and less than 13 minutes until 2025. Thus, our results allow for an accurate scheduling of follow-up observations in the next decade.

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Section: Comparison To the Etd Online Fit Resultsmentioning

confidence: 99%

Ephemeris refinement of 21 hot Jupiter exoplanets with high timing uncertainties

Mallonn

Essen

Herrero

et al. 2019

A&A

Self Cite

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“…K2-29b and K2-30b (EPIC 211089792 and 210957318) are hot Jupiters whose masses were recently measured via Doppler spectroscopy Lillo-Box et al 2016;Santerne et al 2016a). We find FPP < 0.01 for both, and so independently validate these systems.…”

Section: Waspmentioning

confidence: 99%

197 CANDIDATES AND 104 VALIDATED PLANETS IN K2's FIRST FIVE FIELDS

Crossfield¹,

Ciardi²,

Petigura³

et al. 2016

ApJS

198

242

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We present 197 planet candidates discovered using data from the first year of the NASA K2 mission (Campaigns 0-4), along with the results of an intensive program of photometric analyses, stellar spectroscopy, high-resolution imaging, and statistical validation. We distill these candidates into sets of 104 validated planets (57 in multi-planet systems), 30 false positives, and 63 remaining candidates. Our validated systems span a range of properties, with median values of R P = 2.3 R ⊕ , P = 8.6 d, T eff = 5300 K, and Kp = 12.7 mag. Stellar spectroscopy provides precise stellar and planetary parameters for most of these systems. We show that K2 has increased by 30% the number of small planets known to orbit moderately bright stars (1-4 R ⊕ , Kp = 9-13 mag). Of particular interest are 37 planets smaller than 2 R ⊕ , 15 orbiting stars brighter than Kp = 11.5 mag, five receiving Earth-like irradiation levels, and several multi-planet systems -including four planets orbiting the M dwarf K2-72 near mean-motion resonances. By quantifying the likelihood that each candidate is a planet we demonstrate that our candidate sample has an overall false positive rate of 15 − 30%, with rates substantially lower for small candidates (< 2R ⊕ ) and larger for candidates with radii > 8R ⊕ and/or with P < 3 d. Extrapolation of the current planetary yield suggests that K2 will discover between 500 − 1000 planets in its planned four-year mission -assuming sufficient follow-up resources are available. Efficient observing and analysis, together with an organized and coherent follow-up strategy, is essential to maximize the efficacy of planet-validation efforts for K2 , TESS , and future large-scale surveys. 1 We distinguish "confirmed" systems (with measured masses) from "validated" systems (whose planetary nature has been statistically demonstrated, e.g. with false positive probability < 1% ).

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“…The transiting nature of the two known planets allows the application of co-orbital detection techniques, thus avoiding the degeneracy with the eccentricity at first order (Leleu et al 2017). The edge-on orientation of the planetary system also permits the search for co-orbitals through the transit technique (Janson 2013;Lillo-Box et al 2018b). The slow rotational velocity of the star allows precise radial velocity measurements.…”

Section: Introductionmentioning

confidence: 99%

Planetary system LHS 1140 revisited with ESPRESSO and TESS

Lillo-Box

Figueira

Leleu

et al. 2020

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Context. LHS 1140 is an M dwarf known to host two transiting planets at orbital periods of 3.77 and 24.7 days. They were detected with HARPS and Spitzer. The external planet (LHS 1140 b) is a rocky super-Earth that is located in the middle of the habitable zone of this low-mass star. All these properties place this system at the forefront of the habitable exoplanet exploration, and it therefore constitutes a relevant case for further astrobiological studies, including atmospheric observations. Aims. We further characterize this system by improving the physical and orbital properties of the known planets, search for additional planetary-mass components in the system, and explore the possibility of co-orbitals. Methods. We collected 113 new high-precision radial velocity observations with ESPRESSO over a 1.5-yr time span with an average photon-noise precision of 1.07 m s−1. We performed an extensive analysis of the HARPS and ESPRESSO datasets and also analyzed them together with the new TESS photometry. We analyzed the Bayesian evidence of several models with different numbers of planets and orbital configurations. Results. We significantly improve our knowledge of the properties of the known planets LHS 1140 b (Pb ~ 24.7 days) and LHS 1140 c (Pc ~ 3.77 days). We determine new masses with a precision of 6% for LHS 1140 b (6.48 ± 0.46 M⊕) and 9% for LHS 1140 c (mc = 1.78 ± 0.17 M⊕). This reduces the uncertainties relative to previously published values by half. Although both planets have Earth-like bulk compositions, the internal structure analysis suggests that LHS 1140 b might be iron-enriched and LHS 1140 c might be a true Earth twin. In both cases, the water content is compatible to a maximum fraction of 10–12% in mass, which is equivalent to a deep ocean layer of 779 ± 650 km for the habitable-zone planet LHS 1140 b. Our results also provide evidence for a new planet candidate in the system (md = 4.8 ± 1.1M⊕) on a 78.9-day orbital period, which is detected through three independent methods. The analysis also allows us to discard other planets above 0.5 M⊕ for periods shorter than 10 days and above 2 M⊕ for periods up to one year. Finally, our co-orbital analysis discards co-orbital planets in the tadpole and horseshoe configurations of LHS 1140 b down to 1 M⊕ with a 95% confidence level (twice better than with the previous HARPS dataset). Indications for a possible co-orbital signal in LHS 1140 c are detected in both radial velocity (alternatively explained by a high eccentricity) and photometric data (alternatively explained by systematics), however. Conclusions. The new precise measurements of the planet properties of the two transiting planets in LHS 1140 as well as the detection of the planet candidate LHS 1140 d make this system a key target for atmospheric studies of rocky worlds at different stellar irradiations.

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The TROY project

Cited by 26 publications

References 55 publications

Ephemeris refinement of 21 hot Jupiter exoplanets with high timing uncertainties

Ephemeris refinement of 21 hot Jupiter exoplanets with high timing uncertainties

197 CANDIDATES AND 104 VALIDATED PLANETS IN K2's FIRST FIVE FIELDS

Planetary system LHS 1140 revisited with ESPRESSO and TESS

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