Important stellar perturbers found during the StePPeD database update based on Gaia EDR3 data. (arXiv:2206.11047v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Dybczynski_P/0/1/0/all/0/1">Piotr A. Dybczyński</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Berski_F/0/1/0/all/0/1">Filip Berski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tokarek_J/0/1/0/all/0/1">Jakub Tokarek</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Podlewska_Gaca_E/0/1/0/all/0/1">Edyta Podlewska-Gaca</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Langner_K/0/1/0/all/0/1">Krzysztof Langner</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bartczak_P/0/1/0/all/0/1">Przemysław Bartczak</a>
Context. In 2020, the initial version of the Stellar Potential Perturbers
Database (StePPeD) was presented with the aim to deliver up-to-date information
on the stars and stellar systems that may perturb a long-period comet motion.
We used the minimal distance between a star and the Sun as a selecting tool
when compiling a list of interesting objects with close encounters with the
Solar System, and our selection for that study was based on Gaia DR2 data.
Aims. When the Gaia EDR3 data release was published, it became necessary to
update this database. Additionally, we performed Monte Carlo simulations to
obtain uncertainties on the parameters of the closest approach to the Sun of
each object. Methods. We recalculated the close approach parameters of all
stars in the previous StePPeD release, which resulted in removing approximately
one-third of the total. Then we searched for new candidates in the whole Gaia
EDR3 catalogue. We also take into account the duplicity of the found stars and
additionally searched for double stars passing near the Sun which had been
overlooked in previous papers. We also found the necessary mass estimates for
new objects and updated this information for previously selected stars.
Results. After a careful checking of all the collected data, we composed a new
list of 155 potential stellar perturbers of the long-period comet motion. We
applied a new threshold of 2 pc for the minimum star-Sun distance. This list
consists of 146 single stars and nine multiple systems. For each object, we
also estimated the uncertainty of the parameters of their closest approach to
the Sun. Among these stars, we found a new potential strong past perturber, HD
7977, and confirmed the plausibility of a similar action on the part of Gliese
710 in the future.
Context. In 2020, the initial version of the Stellar Potential Perturbers
Database (StePPeD) was presented with the aim to deliver up-to-date information
on the stars and stellar systems that may perturb a long-period comet motion.
We used the minimal distance between a star and the Sun as a selecting tool
when compiling a list of interesting objects with close encounters with the
Solar System, and our selection for that study was based on Gaia DR2 data.
Aims. When the Gaia EDR3 data release was published, it became necessary to
update this database. Additionally, we performed Monte Carlo simulations to
obtain uncertainties on the parameters of the closest approach to the Sun of
each object. Methods. We recalculated the close approach parameters of all
stars in the previous StePPeD release, which resulted in removing approximately
one-third of the total. Then we searched for new candidates in the whole Gaia
EDR3 catalogue. We also take into account the duplicity of the found stars and
additionally searched for double stars passing near the Sun which had been
overlooked in previous papers. We also found the necessary mass estimates for
new objects and updated this information for previously selected stars.
Results. After a careful checking of all the collected data, we composed a new
list of 155 potential stellar perturbers of the long-period comet motion. We
applied a new threshold of 2 pc for the minimum star-Sun distance. This list
consists of 146 single stars and nine multiple systems. For each object, we
also estimated the uncertainty of the parameters of their closest approach to
the Sun. Among these stars, we found a new potential strong past perturber, HD
7977, and confirmed the plausibility of a similar action on the part of Gliese
710 in the future.
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