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Title: Ultra-short period binaries from the Catalina Surveys

We investigate the properties of 367 ultra-short period binary candidates selected from 31,000 sources recently identified from Catalina Surveys data. Based on light curve morphology, along with WISE, Sloan Digital Sky Survey, and GALEX multi-color photometry, we identify two distinct groups of binaries with periods below the 0.22 day contact binary minimum. In contrast to most recent work, we spectroscopically confirm the existence of M dwarf+M dwarf contact binary systems. By measuring the radial velocity variations for five of the shortest-period systems, we find examples of rare cool white dwarf (WD)+M dwarf binaries. Only a few such systems are currently known. Unlike warmer WD systems, their UV flux and optical colors and spectra are dominated by the M-dwarf companion. We contrast our discoveries with previous photometrically selected ultra-short period contact binary candidates and highlight the ongoing need for confirmation using spectra and associated radial velocity measurements. Overall, our analysis increases the number of ultra-short period contact binary candidates by more than an order of magnitude.
Authors:
; ; ; ; ;  [1] ;  [2] ; ;  [3] ;  [4] ;  [5] ; ;  [6]
  1. California Institute of Technology, 1200 East California Boulevard, CA 91225 (United States)
  2. Instituto de Astrofísica de Canarias, Avenida Vía Láctea, 38205 La Laguna, Tenerife (Spain)
  3. Pontificia Universidad Católica de Chile, Departamento de Astronomía y Astrofísica, Facultad de Física, Av. Vicuña Mackena 4860, 782-0436 Macul, Santiago (Chile)
  4. Department of Astronomy, Princeton University, 4 Ivy Lane, Princeton, NJ 08544 (United States)
  5. St. Thomas College, Kozhencheri 689641 (India)
  6. Department of Planetary Sciences, The University of Arizona, Lunar and Planetary Laboratory, 1629 East University Boulevard, Tucson, AZ 85721 (United States)
Publication Date:
OSTI Identifier:
22365447
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 790; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; COLOR; GALAXIES; PHOTOMETRY; RADIAL VELOCITY; SKY; SPECTRA; VARIATIONS; VISIBLE RADIATION; WHITE DWARF STARS