A surprise in the updated list of stellar perturbers of long period comets motion. (arXiv:2003.02069v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+Wysoczanska_R/0/1/0/all/0/1">Rita Wysoczańska</a>, <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:+Polinska_M/0/1/0/all/0/1">Magdalena Polińska</a>
The second Gaia data release (Gaia DR2) provided us with precise
five-parameter astrometry for 1.3 billion of sources. As stars passing close to
the Solar System are thought to be responsible for influencing the dynamical
history of long period comets, thanks to the increase of an amount of data, we
were able to study, with a better accuracy, the sample of stellar perturbers of
a cometary motion. We aim to add new objects to a list of stellar perturbers of
long period comets motion and to revise previously published lists. Special
emphasis was placed on stellar systems as multiplicity of the stars was almost
never considered in this context before. Discussion on sources of masses and
perturber mass estimates are included. Using right ascensions, declinations,
parallaxes, proper motions, and radial velocities, preferably all from Gaia
DR2, augmented with data from other sources when needed, we calculate spatial
positions and velocities for each star. To obtain minimal heliocentric
distances we numerically integrate motion of stars under the Galactic potential
and their mutual interactions. We present the updated list of stellar
perturbers of cometary motion, including masses of perturbers, ready to be used
with data on the observed long period comets to study an individual influence
of a whole sample of perturbers, or specific stars, on a dynamical past or
future of a specific comet. 147 new perturbers were added in comparison to the
previously published sources. Data provided by Gaia DR2 facilitated an
extension of the list of stellar perturbers with new objects and a verification
of these which were earlier classified as the pertubers of cometary motion.
However, lack of radial velocities for millions of stars still hinders our
work. Almost no improvement is visible in a multiple systems field, they have
to be treated with extra diligence.
The second Gaia data release (Gaia DR2) provided us with precise
five-parameter astrometry for 1.3 billion of sources. As stars passing close to
the Solar System are thought to be responsible for influencing the dynamical
history of long period comets, thanks to the increase of an amount of data, we
were able to study, with a better accuracy, the sample of stellar perturbers of
a cometary motion. We aim to add new objects to a list of stellar perturbers of
long period comets motion and to revise previously published lists. Special
emphasis was placed on stellar systems as multiplicity of the stars was almost
never considered in this context before. Discussion on sources of masses and
perturber mass estimates are included. Using right ascensions, declinations,
parallaxes, proper motions, and radial velocities, preferably all from Gaia
DR2, augmented with data from other sources when needed, we calculate spatial
positions and velocities for each star. To obtain minimal heliocentric
distances we numerically integrate motion of stars under the Galactic potential
and their mutual interactions. We present the updated list of stellar
perturbers of cometary motion, including masses of perturbers, ready to be used
with data on the observed long period comets to study an individual influence
of a whole sample of perturbers, or specific stars, on a dynamical past or
future of a specific comet. 147 new perturbers were added in comparison to the
previously published sources. Data provided by Gaia DR2 facilitated an
extension of the list of stellar perturbers with new objects and a verification
of these which were earlier classified as the pertubers of cometary motion.
However, lack of radial velocities for millions of stars still hinders our
work. Almost no improvement is visible in a multiple systems field, they have
to be treated with extra diligence.
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