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Total eclipse of the heart: The AM CVn Gaia14aae / ASSASN-14cn | | H. C. Campbell
; T. R. Marsh
; M. Fraser
; S.T. Hodgkin
; E. de Miguel
; B. T. Gänsicke
; D. Steeghs
; A. Hourihane
; E. Breedt
; S. P. Littlefair
; S. E. Koposov
; L. Wyrzykowski
; G. Altavilla
; N. Blagorodnova
; G. Clementini
; G. Damljanovic
; A. Delgado
; M. Dennefeld
; A. J. Drake
; J. Fernández-Hernández
; G. Gilmore
; R. Gualandi
; A. Hamanowicz
; B. Handzlik
; L. K. Hardy
; D. L. Harrison
; K. Ilkiewicz
; P. G. Jonker
; C. S. Kochanek
; Z. Kolaczkowski
; Z. Kostrzewa-Rutkowska
; R. Kotak
; G. van Leeuwen
; G. Leto
; P. Ochner
; M. Pawlak
; L. Palaversa
; G. Rixon
; K. Rybicki
; B. J. Shappee
; S. J. Smartt
; M. A. P. Torres
; L. Tomasella
; M. Turatto
; K. Ulaczyk
; S. van Velzen
; O. Vince
; N. A. Walton
; P. Wielgórski
; T. Wevers
; P. Whitelock
; A. Yoldas
; F. De Angeli
; P. Burgess
; G. Busso
; R. Busuttil
; T. Butterley
; K. C. Chambers
; C. Copperwheat
; A. B. Danilet
; V. S. Dhillon
; D. W. Evans
; L. Eyer
; D. Froebrich
; A. Gomboc
; G. Holland
; T. W.-S. Holoien
; J. F. Jarvis
; N. Kaiser
; D. A. Kann
; D. Koester
; U. Kolb
; S. Komossa
; E. A. Magnier
; A. Mahabal
; J. Polshaw
; J. L. Prieto
; T. Prusti
; M. Riello
; A. Scholz
; G. Simonian
; K. Z. Stanek
; L. Szabados
; C. Waters
; R. W. Wilson
; | | Date: |
16 Jul 2015 | | Abstract: | We report the discovery and characterisation of a deeply eclipsing AM
CVn-system, Gaia14aae (= ASSASN-14cn). Gaia14aae was identified independently
by the All-Sky Automated Survey for Supernovae (ASAS-SN; Shappee et al. 2014)
and by the Gaia Science Alerts project, during two separate outbursts. A third
outburst is seen in archival Pan-STARRS-1 (PS1; Schlafly et al. 2012; Tonry et
al. 2012; Magnier et al. 2013) and ASAS-SN data. Spectroscopy reveals a hot,
hydrogen-deficient spectrum with clear double-peaked emission lines, consistent
with an accreting double degenerate classification. We use follow-up photometry
to constrain the orbital parameters of the system. We find an orbital period of
49.71 min, which places Gaia14aae at the long period extremum of the
outbursting AM CVn period distribution. Gaia14aae is dominated by the light
from its accreting white dwarf. Assuming an orbital inclination of 90 degrees
for the binary system, the contact phases of the white dwarf lead to lower
limits of 0.78 M solar and 0.015 M solar on the masses of the accretor and
donor respectively and a lower limit on the mass ratio of 0.019. Gaia14aae is
only the third eclipsing AM CVn star known, and the first in which the WD is
totally eclipsed. Using a helium WD model, we estimate the accretor’s effective
temperature to be 12900+-200 K. The three out-burst events occurred within 4
months of each other, while no other outburst activity is seen in the previous
8 years of Catalina Real-time Transient Survey (CRTS; Drake et al. 2009),
Pan-STARRS-1 and ASAS-SN data. This suggests that these events might be
rebrightenings of the first outburst rather than individual events. | | Source: | arXiv, 1507.4663 | | Services: | Forum | Review | PDF | Favorites | |
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