Planets Across Space and Time (PAST). I. Characterizing the Memberships of Galactic Components and Stellar Ages: Revisiting the Kinematic Methods and Applying to Planet Host Stars

Chen, Di-Chang; Xie, Jijia; Zhou, Ji-Lin; Dong, Subo; Liu, Chao; Wang, Haifeng; Xiang, Maosheng; Huang, Yang; Luo, A-Li; Zheng, Zheng

doi:10.3847/1538-4357/abd5be

Cited by 27 publications

(37 citation statements)

References 90 publications

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“…We can also see in the figure that there are stars that have chemical abundances suggesting that they are from the thick disc and yet have stellar velocities similar to that of thin-disc stars. Ho we ver, past surv e ys hav e also shown that galactic thick-disc stars will often hav e similar kinematics to those stars found in the thin disc (Kov ale v et al 2019 ;Chen et al 2021 ).…”

Section: Searching For Thick-disc Hosts Within Galahmentioning

confidence: 64%

“…Due to the complex and non-linear nature that the chemical, kinematic, and dynamic information that stars have with their associated stellar groups, we leave the rest to be characterized in further studies. Having a homogeneous and more inclusive sample of thick-disc stars, such as Chen et al ( 2021 ) and others, would allow exoplanetary scientists to better probe the characteristic planetary population differences between the stellar populations, leading on to implications for astrobiology and habitability across the Milky Way (Santos et al 2017 ).…”

Section: Star Namementioning

confidence: 99%

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The GALAH Survey: improving our understanding of confirmed and candidate planetary systems with large stellar surveys

Clark

Wright

Wittenmyer

et al. 2021

Monthly Notices of the Royal Astronomical Society

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Pioneering photometric, astrometric, and spectroscopic surveys are helping exoplanetary scientists better constrain the fundamental properties of stars within our galaxy, and the planets these stars host. In this study, we use the third data release from the stellar spectroscopic GALAH Survey, coupled with astrometric data of eDR3 from the Gaia satellite, and other data from NASA’s Exoplanet Archive, to refine our understanding of 279 confirmed and candidate exoplanet host stars and their exoplanets. This homogenously analysed data set comprises 105 confirmed exoplanets, along with 146 K2 candidates, 95 TESS Objects of Interest (TOIs) and 52 Community TOIs (CTOIs). Our analysis significantly shifts several previously (unknown) planet parameters while decreasing the uncertainties for others; Our radius estimates suggest that 35 planet candidates are more likely brown dwarfs or stellar companions due to their new radius values. We are able to refine the radii and masses of WASP-47 e, K2-106 b, and CoRoT-7 b to their most precise values yet, to less than 2.3% and 8.5% respectively. We also use stellar rotational values from GALAH to show that most planet candidates will have mass measurements that will be tough to obtain with current ground-based spectrographs. With GALAH’s chemical abundances, we show through chemo-kinematics that there are five planet-hosts that are associated with the galaxy’s thick disc, including NGTS-4, K2-183 and K2-337. Finally, we show there is no statistical difference between the chemical properties of hot Neptune and hot rocky exoplanet hosts, with the possibility that short-period rocky worlds might be the remnant cores of hotter, gaseous worlds.

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Section: Searching For Thick-disc Hosts Within Galahmentioning

confidence: 64%

Section: Star Namementioning

confidence: 99%

The GALAH Survey: improving our understanding of confirmed and candidate planetary systems with large stellar surveys

Clark

Wright

Wittenmyer

et al. 2021

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…We can also see in the Figure, that there are stars that have chemical abundances suggesting that they are from the thick-disc, yet have stellar velocities similar to that of thin disk stars. However, past surveys have also shown that galactic thick-disc stars will often have similar kinematics to those stars found in the thin-disc (Chen et al 2021;Kovalev et al 2019).…”

Section: Searching For Thick-disc Hosts Within Galahmentioning

confidence: 92%

“…Due to the complex and non-linear nature that the chemical, kinematic and dynamic information that stars have with their associated stellar groups, we leave the rest to be characterised in further studies. Having a homogeneous and more inclusive sample of thick-disc stars, such as Chen et al (2021) and others, would allow exoplanetary scientists to better probe the characteristic planetary population differences between the stellar populations, leading onto implications for astrobiology and habitability across the Milky Way (Santos et al 2017).…”

Section: Searching For Thick-disc Hosts Within Galahmentioning

confidence: 99%

The GALAH Survey: Improving our understanding of confirmed and candidate planetary systems with large stellar surveys

Clark,

Wright,

Wittenmyer

et al. 2021

Preprint

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Pioneering photometric, astrometric, and spectroscopic surveys are helping exoplanetary scientists better constrain the fundamental properties of stars within our galaxy, and the planets these stars host. In this study, we use the third data release from the stellar spectroscopic GALAH Survey, coupled with astrometric data of eDR3 from the Gaia satellite, and other data from NASA's Exoplanet Archive, to refine our understanding of 279 confirmed and candidate exoplanet host stars and their exoplanets. This homogenously analysed data set comprises 105 confirmed exoplanets, along with 146 K2 candidates, 95 TESS Objects of Interest (TOIs) and 52 Community TOIs (CTOIs). Our analysis significantly shifts several previously (unknown) planet parameters while decreasing the uncertainties for others; Our radius estimates suggest that 35 planet candidates are more likely brown dwarfs or stellar companions due to their new radius values. We are able to refine the radii and masses of WASP-47 e, K2-106 b, and CoRoT-7 b to their most precise values yet, to less than 2.3% and 8.5% respectively. We also use stellar rotational values from GALAH to show that most planet candidates will have mass measurements that will be tough to obtain with current ground-based spectrographs. With GALAH's chemical abundances, we show through chemo-kinematics that there are five planet-hosts that are associated with the galaxy's thick disc, including NGTS-4, K2-183 and K2-337. Finally, we show there is no statistical difference between the chemical properties of hot Neptune and hot rocky exoplanet hosts, with the possibility that short-period rocky worlds might be the remnant cores of hotter, gaseous worlds.

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“…Towards a Galactic census of planets, we have started a research project, dubbed Planets Across Space and Time (PAST). In the Paper I (here after PAST I, Chen et al 2021) of the PAST series, we revisited the kinematic methods for classification of Galactic components and extended the applicable range of the methods from ∼ 100 − 200 pc to ∼ 1.5 kpc to cover most of planet candidate host stars. Additional, we revised the Age-Velocity dispersion Relation (AVR), which allows us to derive kinematic age with a typical uncertainty of ∼ 10 − 20% for an ensemble of stars.…”

Section: Introductionmentioning

confidence: 99%

Planets Across Space and Time (PAST). II: Catalog and Analyses of the LAMOST-Gaia-Kepler Stellar Kinematic Properties

Chen,

Yang,

Xie

et al. 2021

Preprint

Self Cite

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The Kepler telescope has discovered over 4,000 planets (candidates) by searching ∼ 200,000 stars over a wide range of distance (order of kpc) in our Galaxy. Characterizing the kinematic properties (e.g., Galactic component membership and kinematic age) of these Kepler targets (including the planet candidate hosts) is the first step towards studying Kepler planets in the Galactic context, which will reveal fresh insights into planet formation and evolution. In this paper, the second part of the Planets Across the Space and Time (PAST) series, by combining the data from LAMOST and Gaia and then applying the revised kinematic methods from PAST I, we present a catalog of kinematic properties (i.e., Galactic positions, velocities, and the relative membership probabilities among the thin disk, thick disk, Hercules stream, and the halo) as well as other basic stellar parameters for 35,835 Kepler stars. Further analyses of the LAMOST-Gaia-Kepler catalog demonstrate that our derived kinematic age reveals the expected stellar activity-age trend. Furthermore, we find that the fraction of thin (thick) disk stars increases (decreases) with the transiting planet multiplicity (N p = 0, 1, 2 and 3+) and the kinematic age decreases with N p , which could be a consequence of the dynamical evolution of planetary architecture with age. The LAMOST-Gaia-Kepler catalog will be useful for future studies on the correlations between the exoplanet distributions and the stellar Galactic environments as well as ages.

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Planets Across Space and Time (PAST). I. Characterizing the Memberships of Galactic Components and Stellar Ages: Revisiting the Kinematic Methods and Applying to Planet Host Stars

Cited by 27 publications

References 90 publications

The GALAH Survey: improving our understanding of confirmed and candidate planetary systems with large stellar surveys

The GALAH Survey: improving our understanding of confirmed and candidate planetary systems with large stellar surveys

The GALAH Survey: Improving our understanding of confirmed and candidate planetary systems with large stellar surveys

Planets Across Space and Time (PAST). II: Catalog and Analyses of the LAMOST-Gaia-Kepler Stellar Kinematic Properties

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