COMPANIONS TO APOGEE STARS. I. A MILKY WAY-SPANNING CATALOG OF STELLAR AND SUBSTELLAR COMPANION CANDIDATES AND THEIR DIVERSE HOSTS
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Tartalom: http://real.mtak.hu/40870/
Archívum: MTA Könyvtár
Gyűjtemény: Status = Published

Type = Article
Cím:
COMPANIONS TO APOGEE STARS. I. A MILKY WAY-SPANNING CATALOG OF STELLAR AND SUBSTELLAR COMPANION CANDIDATES AND THEIR DIVERSE HOSTS
Létrehozó:
Troup, Nicholas
MĂŠszĂĄros, Szabolcs
Kiadó:
The American Astronomical Society
Dátum:
2016
Téma:
QB Astronomy, Astrophysics / csillagĂĄszat, asztrofizika
Tartalmi leírás:
In its three years of operation, the Sloan Digital Sky Survey Apache Point Observatory Galactic Evolution
Experiment (APOGEE-1) observed >14,000 stars with enough epochs over a sufficient temporal baseline for the
fitting of Keplerian orbits. We present the custom orbit-fitting pipeline used to create this catalog, which includes
novel quality metrics that account for the phase and velocity coverage of a fitted Keplerian orbit. With a typical
radial velocity precision of ∼100–200 m s−1, APOGEE can probe systems with small separation companions down
to a few Jupiter masses. Here we present initial results from a catalog of 382 of the most compelling stellar and
substellar companion candidates detected by APOGEE, which orbit a variety of host stars in diverse Galactic
environments. Of these, 376 have no previously known small separation companion. The distribution of
companion candidates in this catalog shows evidence for an extremely truncated brown dwarf (BD) desert with a
paucity of BD companions only for systems with a < 0.1–0.2 AU, with no indication of a desert at larger orbital
separation. We propose a few potential explanations of this result, some which invoke this catalog’s many small
separation companion candidates found orbiting evolved stars. Furthermore, 16 BD and planet candidates have
been identified around metal-poor ([Fe/H] < −0.5) stars in this catalog, which may challenge the core accretion
model for companions >10MJup. Finally, we find all types of companions are ubiquitous throughout the Galactic
disk with candidate planetary-mass and BD companions to distances of ∟6 and ∟16 kpc, respectively.
Nyelv:
magyar
Típus:
Article
PeerReviewed
info:eu-repo/semantics/article
Formátum:
text
Azonosító:
Troup, Nicholas and MĂŠszĂĄros, Szabolcs (2016) COMPANIONS TO APOGEE STARS. I. A MILKY WAY-SPANNING CATALOG OF STELLAR AND SUBSTELLAR COMPANION CANDIDATES AND THEIR DIVERSE HOSTS. The Astronomical Journal, 151 (3). pp. 1-25. ISSN 1538-3881
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