2021
DOI: 10.1093/mnras/stab2225
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Optimized modelling of GaiaHipparcos astrometry for the detection of the smallest cold Jupiter and confirmation of seven low-mass companions

Abstract: To fully constrain the orbits of low mass circumstellar companions, we conduct combined analyses of the radial velocity data as well as the Gaia and Hipparcos astrometric data for eight nearby systems. Our study shows that companion-induced position and proper motion differences between Gaia and Hipparcos are significant enough to constrain orbits of low mass companions to a precision comparable with previous combined analyses of direct imaging and radial velocity data. We find that our method is robust to whe… Show more

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Cited by 18 publications
(8 citation statements)
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“…Instead of calibrating Gaia and Hipparcos catalogs a priori, we fit the calibration parameters and signal-model parameters simultaneously to the raw catalog data to avoid overfitting problems caused by conducting calibration before signal search (Foreman-Mackey et al 2015;Feng et al 2017). This method is optimal compared with the previous methods in terms of constraining the masses and orbits of small planets according to Feng et al (2021).…”
Section: Methodsmentioning
confidence: 99%
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“…Instead of calibrating Gaia and Hipparcos catalogs a priori, we fit the calibration parameters and signal-model parameters simultaneously to the raw catalog data to avoid overfitting problems caused by conducting calibration before signal search (Foreman-Mackey et al 2015;Feng et al 2017). This method is optimal compared with the previous methods in terms of constraining the masses and orbits of small planets according to Feng et al (2021).…”
Section: Methodsmentioning
confidence: 99%
“…Considering that the models and numerical methods are introduced by Feng et al (2019a) and Feng et al (2021), we only briefly describe the methodology in this section. The radial velocity model consists of Keplerian components and red noise components that are modeled using the moving average model (MA; Tuomi et al 2013 andFeng et al 2016).…”
Section: Methodsmentioning
confidence: 99%
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“…By comparing data from HIPPARCOS with the second data release from Gaia, Brandt (2018; which has since been updated to the Gaia Early Data Release 3, EDR3; see Brandt 2021) and Kervella et al (2019) have both separately released catalogs of stars exhibiting astrometric accelerations. These catalogs have been used for follow-up to efficiently find new brown dwarfs (Bowler et al 2021;Bonavita et al 2022;Kuzuhara et al 2022) and exoplanets (Errico et al 2022) and to dynamically characterize previously known systems (Brandt et al 2021;Feng et al 2021;Li et al 2021;Steiger et al 2021;Zeng et al 2021;Biller et al 2022;Dupuy et al 2022;Franson et al 2022).…”
Section: Introductionmentioning
confidence: 99%
“…Recently, a new method that utilizes RV data with propermotion data from both Hipparcos and Gaia has been developed independently by several groups (Feng et al 2019;Brandt et al 2021c;Feng et al 2021;Venner et al 2021;Kervella et al 2022). The positional differences between the Hipparcos and Gaia measurements with a ∼25 yr span can offer new and precise proper motions of individual stars, the variation of which may indicate the presence of unseen companions.…”
Section: Introductionmentioning
confidence: 99%