5 research outputs found
Age distribution of exoplanet host stars: Chemical and Kinematics age proxies from GAIA DR3
The GAIA space mission is impacting astronomy in many significant ways by
providing a uniform, homogeneous and precise data set for over 1 billion stars
and other celestial objects in the Milky Way and beyond. Exoplanet science has
greatly benefited from the unprecedented accuracy of stellar parameters
obtained from GAIA. In this study, we combine photometric, astrometric, and
spectroscopic data from the most recent Gaia DR3 to examine the kinematic and
chemical age proxies for a large sample of 2611 exoplanets hosting stars whose
parameters have been determined uniformly. Using spectroscopic data from the
Radial Velocity Spectrometer (RVS) onboard GAIA, we show that stars hosting
massive planets are metal-rich and -poor in comparison to stars hosting
small planets. The kinematic analysis of the sample reveals that the stellar
systems with small planets and those with giant planets differ in key aspects
of galactic space velocity and orbital parameters, which are indicative of age.
We find that the galactic orbital parameters have a statistically significant
difference of 0.06 kpc for and 0.03 for eccentricity respectively.
Furthermore, we estimated the stellar ages of the sample using the MIST-MESA
isochrone models. The ages and its proxies for the planet-hosting stars
indicate that the hosts of giant planetary systems are younger compared to the
population of stars harboring small planets. These age trends are also
consistent with the chemical evolution of the galaxy and the formation of giant
planets from the core-accretion process.Comment: Accepted for Publication in The Astronomical Journa
Age Distribution of Exoplanet Host Stars: Chemical and Kinematic Age Proxies from GAIA DR3
The GAIA space mission is impacting astronomy in many significant ways by providing a uniform, homogeneous, and precise data set for over 1 billion stars and other celestial objects in the Milky Way and beyond. Exoplanet science has greatly benefited from the unprecedented accuracy of the stellar parameters obtained from GAIA. In this study, we combine photometric, astrometric, and spectroscopic data from the most recent Gaia DR3 to examine the kinematic and chemical age proxies for a large sample of 2611 exoplanets hosting stars whose parameters have been determined uniformly. Using spectroscopic data from the Radial Velocity Spectrometer on board GAIA, we show that stars hosting massive planets are metal-rich and α -poor in comparison to stars hosting small planets. The kinematic analysis of the sample reveals that stellar systems with small planets and those with giant planets differ in key aspects of galactic space velocity and orbital parameters, which are indicative of age. We find that the galactic orbital parameters have a statistically significant difference of 0.06 kpc for Z _max and 0.03 for eccentricity, respectively. Furthermore, we estimated the stellar ages of the sample using the MIST-MESA isochrone models. The ages and their proxies for the planet-hosting stars indicate that the hosts of giant planetary systems are younger when compared to the population of stars harboring small planets. These age trends are also consistent with the chemical evolution of the galaxy and the formation of giant planets from the core-accretion process
The TESS-Keck Survey. VIII. Confirmation of a Transiting Giant Planet on an Eccentric 261 Day Orbit with the Automated Planet Finder Telescope
We report the discovery of TOI-2180 b, a 2.8 giant planet
orbiting a slightly evolved G5 host star. This planet transited only once in
Cycle 2 of the primary Transiting Exoplanet Survey Satellite (TESS) mission.
Citizen scientists identified the 24 hr single-transit event shortly after the
data were released, allowing a Doppler monitoring campaign with the Automated
Planet Finder telescope at Lick Observatory to begin promptly. The radial
velocity observations refined the orbital period of TOI-2180 b to be
260.80.6 days, revealed an orbital eccentricity of 0.3680.007, and
discovered long-term acceleration from a more distant massive companion. We
conducted ground-based photometry from 14 sites spread around the globe in an
attempt to detect another transit. Although we did not make a clear transit
detection, the nondetections improved the precision of the orbital period. We
predict that TESS will likely detect another transit of TOI-2180 b in Sector 48
of its extended mission. We use giant planet structure models to retrieve the
bulk heavy-element content of TOI-2180 b. When considered alongside other giant
planets with orbital periods over 100 days, we find tentative evidence that the
correlation between planet mass and metal enrichment relative to stellar is
dependent on orbital properties. Single-transit discoveries like TOI-2180 b
highlight the exciting potential of the TESS mission to find planets with long
orbital periods and low irradiation fluxes despite the selection biases
associated with the transit method.Comment: Published in A
Proceedings of International Web Conference in Civil Engineering for a Sustainable Planet
This proceeding contains articles of the various research ideas of the academic community and practitioners accepted at the "International Web Conference in Civil Engineering for a Sustainable Planet (ICCESP 2021)". ICCESP 2021 is being Organized by the Habilete Learning Solutions, Kollam in Collaboration with American Society of Civil Engineers (ASCE), TKM College of Engineering, Kollam, and Baselios Mathews II College of Engineering, Kollam, Kerala, India.
Conference Title: International Web Conference in Civil Engineering for a Sustainable PlanetConference Acronym: ICCESP 2021Conference Date: 05–06 March 2021Conference Location: Online (Virtual Mode)Conference Organizer: Habilete Learning Solutions, Kollam, Kerala, IndiaCollaborators: American Society of Civil Engineers (ASCE), TKM College of Engineering, Kollam, and Baselios Mathews II College of Engineering, Kollam, Kerala, India