WIDE COMPANIONS TO HIPPARCOS STARS WITHIN 67 pc OF THE SUN

By A. Tokovinin, S. Lépine. 2012

236 citations recorded by the source corpus.

A catalog of common-proper-motion (CPM) companions to stars within 67 pc of the Sun is constructed based on the SUPERBLINK proper-motion survey. It contains 1392 CPM pairs with angular separations 30″ < ρ < 1800″, relative proper motion between the two components less than 25 mas yr−1, and magnitudes and colors of the secondaries consistent with those of dwarfs in the (MV, V − J) diagram. In addition, we list 21 candidate white dwarf CPM companions with separations under 300″, about half of which should be physical. We estimate a 0.31 fraction of pairs with red dwarf companions to be physical systems (about 425 objects), while the rest (mostly wide pairs) are chance alignments. For each candidate companion, the probability of a physical association is evaluated. The distribution of projected separations s of the physical pairs between 2 kAU and 64 kAU follows f(s)∝s−1.5, which decreases faster than Öpik's law. We find that solar-mass dwarfs have no less than 4.4% ± 0.3% companions with separations larger than 2 kAU, or 3.8% ± 0.3% per decade of orbital separation in the 2–16 kAU range. The distribution of mass ratio of those wide companions is approximately uniform in the 0.1 < q < 1.0 range, although we observe a dip at q ≃ 0.5 which, if confirmed, could be evidence of bimodal distribution of companion masses. New physical CPM companions to two exoplanet host stars are discovered.

Subfields: Astronomy and Astrophysics, Electrical and Electronic Engineering, Instrumentation

View Paper: https://www.semanticscholar.org/paper/263e505d000b76b421c65c92e0d1d9eb5137c321

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. A. Mann
2. E. Gaidos
3. E. Hilton
4. A. Tokovinin
5. S. Lépine
6. J. Brewer
7. Harvard-Smithsonian Cfa
8. G. Duchêne

In Electrical and Electronic Engineering

1. A. Tokovinin
2. O. Siegmund

In Instrumentation

1. A. Mann
2. E. Gaidos
3. E. Hilton
4. A. Tokovinin
5. J. Brewer
6. S. Lépine
7. Harvard-Smithsonian Cfa
8. G. Duchêne

Citations in the corpus

• OBSERVATIONS OF HIERARCHICAL SOLAR-TYPE MULTIPLE STAR SYSTEMS (2015, unknown): “′′89, and the CPM companion C at 494′′ (Tokovinin & Lépine 2012).”
• FROM BINARIES TO MULTIPLES. I. DATA ON F AND G DWARFS WITHIN 67 pc OF THE SUN (2014, methodology): “Uniform screening of stars within 67 pc for wide companions down to V = 19 became possible with the SUPERBLINK survey (Tokovinin & Lépine 2012), except 39% targets with small PM.”
• Stellar Multiplicity (2013, background): “While Öpik’s law is a reasonable first approximation, 4 Gaspard Duchêne & Adam Kraus the distribution cuts off at both extremes (Heintz 1969), although the exact location of the “breaks” are somewhat ill-defined (e.g., Poveda, Allen & Hernández-Alcántara 2007; Tokovinin & Lépine 2012).”
• PROSPECTING IN LATE-TYPE DWARFS: A CALIBRATION OF INFRARED AND VISIBLE SPECTROSCOPIC METALLICITIES OF LATE K AND M DWARFS SPANNING 1.5 dex (2012, methodology): “We can estimate the number of interlopers by cross referencing our sample with that of Tokovinin & Lépine (2012).”