Didier Laloum
A5027106414- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Advanced Measurement and Metrology Techniques
- Geomagnetism and Paleomagnetism Studies
- Optical Systems and Laser Technology
- Astronomical and nuclear sciences
- Planetary Science and Exploration
American Association of Variable Star Observers
2022-2023
Société Géologique de France
2021-2023
Abstract The ExoClock project is an inclusive, integrated, and interactive platform that was developed to monitor the ephemerides of Ariel targets increase mission efficiency. makes best use all available resources, i.e., observations from ground telescopes, midtime values literature, finally, space instruments. Currently, network includes 280 participants with telescopes capable observing 85% currently known candidate targets. This work results ∼1600 obtained up 2020 December 31 network....
Abstract NASA’s Transiting Exoplanet Survey Satellite (TESS) mission promises to improve our understanding of hot Jupiters by providing an all-sky, magnitude-limited sample transiting suitable for population studies. Assembling such a requires confirming hundreds planet candidates with additional follow-up observations. Here we present 20 that were detected using TESS data and confirmed be planets through photometric, spectroscopic, imaging observations coordinated the Follow-up Observing...
Abstract The Kepler and TESS missions have demonstrated that planets are ubiquitous. However, the success of these heavily depends on ground-based radial velocity (RV) surveys, which combined with transit photometry can yield bulk densities orbital properties. While most host stars too faint for detailed follow-up observations, is detecting orbiting nearby bright more amenable to RV characterization. Here, we introduce TESS-Keck Survey (TKS), an program using ∼100 nights Keck/HIRES study...
Abstract Astronomers do not have a complete picture of the effects wide-binary companions (semimajor axes greater than 100 au) on formation and evolution exoplanets. We investigate these using new data from Gaia Early Data Release 3 Transiting Exoplanet Survey Satellite mission to characterize systems with transiting identify sample 67 exoplanet candidates (with well-determined, edge-on orbital inclinations) that reside in wide visual binary systems. derive limits parameters for measure...
We report the discovery of TOI-2180 b, a 2.8 $M_{\rm J}$ giant planet orbiting slightly evolved G5 host star. This transited only once in Cycle 2 primary Transiting Exoplanet Survey Satellite (TESS) mission. Citizen scientists identified 24 hr single-transit event shortly after data were released, allowing Doppler monitoring campaign with Automated Planet Finder telescope at Lick Observatory to begin promptly. The radial velocity observations refined orbital period b be 260.8$\pm$0.6 days,...
ABSTRACT We present the discovery and characterization of six short-period, transiting giant planets from NASA’s Transiting Exoplanet Survey Satellite (TESS) -- TOI-1811 (TIC 376524552), TOI-2025 394050135), TOI-2145 88992642), TOI-2152 395393265), TOI-2154 428787891), TOI-2497 97568467). All orbit bright host stars (8.9 <G < 11.8, 7.7 <K 10.1). Using a combination time-series photometric spectroscopic follow-up observations TESS Follow-up Observing Program Working...
Warm Jupiters are close-in giant planets with relatively large planet-star separations (i.e., $10< a/R_\star <100$). Given their weak tidal interactions host stars, measurements of stellar obliquity may be used to probe the initial distribution and dynamical history for gas giants. Using spectroscopic observations, we confirm planetary nature TOI-1859b determine TOI-1859 $\lambda = 38.9^{+2.8}_{-2.7}\deg$ relative its companion using Rossiter-McLaughlin effect. is a 64-day warm Jupiter...
Abstract We present the discovery of TOI-1518b—an ultra-hot Jupiter orbiting a bright star ( V = 8.95). The transiting planet is confirmed using high-resolution optical transmission spectra from EXPRES. It inflated, with R p 1.875 ± 0.053 J , and exhibits several interesting properties, including misaligned orbit <?CDATA ${240.34}_{-0.98}^{+0.93}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mn>240.34</mml:mn> </mml:mrow>...
Abstract We present the discovery of TOI-1420b, an exceptionally low-density ( ρ = 0.08 ± 0.02 g cm −3 ) transiting planet in a P 6.96 days orbit around late G-dwarf star. Using transit observations from TESS, LCOGT, Observatoire Privé du Mont, Whitin, Wendelstein, OAUV, Ca l’Ou, and KeplerCam, along with radial velocity HARPS-N NEID, we find that has radius R p 11.9 0.3 ⊕ mass M 25.1 3.8 . TOI-1420b is largest known less than 50 , indicating it contains sizeable envelope hydrogen helium....
We report the confirmation and characterization of four hot Jupiter-type exoplanets initially detected by TESS: TOI-1295 b, TOI-2580 TOI-6016 TOI-6130 b. Using observations with high-resolution echelle spectrograph MaHPS on 2.1 m telescope at Wendelstein Observatory, together NEID Kitt Peak National Observatory TRES Fred Lawrence Whipple we confirmed planetary nature these planet candidates. also performed precise mass measurements. All planets are found to be Jupiters orbital periods...
We present the discovery of two new transiting extrasolar planet candidates identified as TOI-1296.01 and TOI-1298.01 by Transiting Exoplanet Survey Satellite (TESS). The planetary nature these has been secured with SOPHIE high-precision spectrograph through measurement companion's mass radial velocity method. Both planets are similar to Saturn in have orbital periods a few days. They, however, show discrepant radii therefore different densities. radius discrepancy might be explained levels...
Warm Jupiters are close-in giant planets with relatively large planet-star separations (i.e., $10< a/R_\star <100$). Given their weak tidal interactions host stars, measurements of stellar obliquity may be used to probe the initial distribution and dynamical history for gas giants. Using spectroscopic observations, we confirm planetary nature TOI-1859b determine TOI-1859 $λ= 38.9^{+2.8}_{-2.7}°$ relative its companion using Rossiter-McLaughlin effect. is a 64-day warm Jupiter orbiting...
We present the discovery of TOI-1420b, an exceptionally low-density ($ρ= 0.08\pm0.02$ g cm$^{-3}$) transiting planet in a $P = 6.96$ day orbit around late G dwarf star. Using transit observations from TESS, LCOGT, OPM, Whitin, Wendelstein, OAUV, Ca l'Ou, and KeplerCam along with radial velocity HARPS-N NEID, we find that has radius $R_p$ 11.9 $\pm$ 0.3 $R_\Earth$ mass $M_p$ 25.1 3.8 $M_\Earth$. TOI-1420b is largest-known less than $50M_\Earth$, indicating it contains sizeable envelope...
We present the discovery and characterization of six short-period, transiting giant planets from NASA's Transiting Exoplanet Survey Satellite (TESS) -- TOI-1811 (TIC 376524552), TOI-2025 394050135), TOI-2145 88992642), TOI-2152 395393265), TOI-2154 428787891), & TOI-2497 97568467). All orbit bright host stars (8.9
NASA's Transiting Exoplanet Survey Satellite (TESS) mission promises to improve our understanding of hot Jupiters by providing an all-sky, magnitude-limited sample transiting suitable for population studies. Assembling such a requires confirming hundreds planet candidates with additional follow-up observations. Here, we present twenty that were detected using TESS data and confirmed be planets through photometric, spectroscopic, imaging observations coordinated the Follow-up Observing...