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Total eclipse of the heart: the AM CVn Gaia14aae/ASSASN-14cn

Campbell, HC and Marsh, TR and Fraser, M and Hodgkin, ST and de Miguel, E and Gaensicke, BT and Steeghs, D and Hourihane, A and Breedt, E and Littlefair, SP and Koposov, SE and Wyrzykowski, L and Altavilla, G and Blagorodnova, N and Clementini, G and Damljanovic, G and Delgado, A and Dennefeld, M and Drake, AJ and Fernandez-Hernandez, J and Gilmore, G and Gualandi, R and Hamanowicz, A and Handzlik, B and Hardy, LK and Harrison, DL and Ilkiewicz, K and Jonker, PG and Kochanek, CS and Kolaczkowski, Z and Kostrzewa-Rutkowska, Z and Kotak, R and van Leeuwen, G and Leto, G and Ochner, P and Pawlak, M and Palaversa, L and Rixon, G and Rybicki, K and Shappee, BJ and Smartt, SJ and Torres, MAP and Tomasella, L and Turatto, M and Ulaczyk, K and van Velzen, S and Vince, O and Walton, NA and Wielgorski, P and Wevers, T and Whitelock, P and Yoldas, A and De Angeli, F and Burgess, P and Busso, G and Busuttil, R and Butterley, T and Chambers, KC and Copperwheat, CM and Danilet, AB and Dhillon, VS and Evans, DW and Eyer, L and Froebrich, D and Gomboc, A and Holland, G and Holoien, TW-S and Jarvis, JF and Kaiser, N and Kann, DA and Koester, D and Kolb, U and Komossa, S and Magnier, EA and Mahabal, A and Polshaw, J and Prieto, JL and Prusti, T and Riello, M and Scholz, A and Simonian, G and Stanek, KZ and Szabados, L and Waters, C and Wilson, RW (2015) Total eclipse of the heart: the AM CVn Gaia14aae/ASSASN-14cn. Monthly Notices of the Royal Astronomical Society, 452 (1). pp. 1060-1067. ISSN 0035-8711

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Abstract

We report the discovery and characterization 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.) 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° for the binary system, the contact phases of the WD lead to lower limits of 0.78 and 0.015 M⊙ 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 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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society] ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 20 Jan 2017 10:51
Last Modified: 08 Sep 2017 02:53
DOI or Identification number: 10.1093/mnras/stv1224
URI: http://researchonline.ljmu.ac.uk/id/eprint/5328

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