Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 452, Issue 1, Pages 1060-1067Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv1224
Keywords
binaries: eclipsing; novae, cataclysmic variables
Categories
Funding
- European Union FP7 programme through ERC [320360, 320964]
- UK STFC [ST/L00073]
- Leverhulme Trust [RPG-2012-541]
- PRIN-INAF Transient Universe: unveiling new types of stellar explosions with PESSTO
- European Union Seventh Framework Programme [FP7] [264895]
- Polish NCN [2012/06/M/ST9/00172, 2011/03/B/ST9/02667]
- OPTICON FP7 EC [312430]
- Polish MNiSW [W32/7.PR/2014]
- DOE Computational Science Graduate Fellowship [DE-FG02-97ER25308]
- FONDECYT [1151445]
- Ministry of Economy, Development, and Tourism's Millennium Science Initiative [IC120009]
- Institute of Astronomy and Rozhen NAO BAS
- Ministry of Education, Science and Technological Development of the Republic of Serbia [176011, 176004, 176021]
- NASA through Hubble Fellowship - Space Telescope Science Institute [HF-51348.001]
- NASA [NAS 5-26555]
- National Research Foundation
- Comite Cientifico Internacional (CCI) of the European Northern Observatory (ENO) in the Canary Islands
- NSF [AST-1238877]
- NASA by the Planetary Science Division of the NASA Science Mission Directorate [NNX08AR22G]
- NEO Observation Program [NNX12AR65G, NNX14AM74G]
- NASA through the Science Mission Directorate Near-Earth Objects Observations Program [NNG05GF22G]
- US National Science Foundation [AST-0909182, AST-1313422]
- STFC [ST/M003515/1, ST/L006553/1, ST/M001970/1, ST/L001381/1, ST/L000709/1, ST/N000498/1, ST/J00541X/1, ST/M007626/1, ST/L000776/1, ST/M002012/1, ST/L000733/1, ST/M001350/1, ST/K000985/1, ST/L00075X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J00541X/1, ST/K000985/1, ST/L001381/1, ST/M003515/1, ST/M001350/1, ST/L000776/1, ST/L000733/1, ST/L006553/1, ST/M007626/1, ST/M001970/1, ST/L000709/1, ST/L00075X/1, ST/N000498/1] Funding Source: researchfish
- UK Space Agency [ST/N000641/1, ST/K000756/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1413600, 1238877] Funding Source: National Science Foundation
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We report the discovery and characterization of a deeply eclipsingAMCVn-system, Gaia14aae (=ASSASN-14cn). Gaia14aae was identified independently by the All-Sky Automated Survey for Supernovae (ASAS-SN; Shappee et al.) 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.; Tonry et al.; Magnier et al.) 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 (WD). Assuming an orbital inclination of 90 degrees for the binary system, the contact phases of the WD lead to lower limits of 0.78 and 0.015M(circle dot) 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 AMCVn 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 12 900 +/- 200 K. The three outburst events occurred within four months of each other, while no other outburst activity is seen in the previous 8 yr of Catalina Real-time Transient Survey (CRTS; Drake et al.), Pan-STARRS-1 and ASAS-SN data. This suggests that these events might be rebrightenings of the first outburst rather than individual events.
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