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The most massive heartbeat: an in-depth analysis of ι Orionis

Pablo, H. and Richardson, N. D. and Fuller, J. and Rowe, J. and Moffat, A. F. J. and Kuschnig, R. and Popowicz, A. and Handler, G. and Neiner, C. and Pigulski, A. and Wade, G. A. and Weiss, W. and Buysschaert, B. and Ramiaramanantsoa, T. and Bratcher, A. D. and Gerhartz, C. J. and Greco, J. J. and Hardegree-Ullman, K. and Lembryk, L. and Oswald, W. L. (2017) The most massive heartbeat: an in-depth analysis of ι Orionis. Monthly Notices of the Royal Astronomical Society, 467 (2). pp. 2494-2503. ISSN 0035-8711. doi:10.1093/mnras/stx207.

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ι Ori is a well-studied massive binary consisting of an O9 III + B1 III/IV star. Due to its high eccentricity (e = 0.764) and short orbital period (Porb = 29.133 76 d), it has been considered to be a good candidate to show evidence of tidal effects; however, none have previously been identified. Using photometry from the BRIght Target Explorer (BRITE)-Constellation space photometry mission, we have confirmed the existence of tidal distortions through the presence of a heartbeat signal at periastron. We combine spectroscopic and light-curve analyses to measure the masses and radii of the components, revealing ι Ori to be the most massive heartbeat system known to date. In addition, using a thorough frequency analysis, we also report the unprecedented discovery of multiple tidally induced oscillations in an O star. The amplitudes of the pulsations allow us to empirically estimate the tidal circularization rate, yielding an effective tidal quality factor Q ∼ 4 × 10^4.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Pablo, H.0000-0002-1355-5860
Richardson, N. D.0000-0002-2806-9339
Fuller, J.0000-0002-4544-0750
Rowe, J.0000-0002-5904-1865
Neiner, C.0000-0003-1978-9809
Greco, J. J.0000-0002-4649-1568
Hardegree-Ullman, K.0000-0003-3702-0382
Additional Information:© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 January 19. Received 2017 January 18; in original form 2016 November 18. This work is based on data collected by the BRITE Constellation satellite mission, designed, built, launched, operated and supported by the Austrian Research Promotion Agency (FFG), the University of Vienna, the Technical University of Graz, the Canadian Space Agency (CSA), the University of Toronto Institute for Aerospace Studies (UTIAS), the Foundation for Polish Science & Technology (FNiTP MNiSW) and National Science Centre (NCN). We would like to thank the computing infrastructure at Villanova for use of their cluster. NDR acknowledges postdoctoral support by the University of Toledo and by the Helen Luedtke Brooks Endowed Professorship. AFJM and HP are grateful for financial aid from NSERC (Canada) and FQRNT (Quebec).GAW acknowledges Discovery Grant support from the Natural Science and Engineering Research Council (NSERC) of Canada. AP acknowledges support from the NCN grant no. 2016/21/B/ST9/01126. JF acknowledges partial support from NSF under grant no. AST1205732 and through a Lee DuBridge Fellowship at Caltech. GH acknowledges support from the Polish NCN grant 2015/18/A/ST9/00578. The Polish participation in the BRITE project is secured by NCN grant 2011/01/M/ST9/05914. APo acknowledges NCN grant 2016/21/D/ST9/00656.
Group:TAPIR, Walter Burke Institute for Theoretical Physics, Astronomy Department
Funding AgencyGrant Number
Austrian Research Promotion Agency (FFG)UNSPECIFIED
University of ViennaUNSPECIFIED
Technical University of GrazUNSPECIFIED
Canadian Space Agency (CSA)UNSPECIFIED
University of TorontoUNSPECIFIED
Foundation for Polish Science & Technology (FNiTP MNiSW)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Fonds Québécois de la Recherche sur la Nature et les Technologies (FQRNT)UNSPECIFIED
National Science Centre (Poland)2016/21/B/ST9/01126
Lee A. DuBridge FoundationUNSPECIFIED
National Science Centre (Poland)2015/18/A/ST9/00578
National Science Centre (Poland)2011/01/M/ST9/05914
National Science Centre (Poland)2016/21/D/ST9/00656
Issue or Number:2
Record Number:CaltechAUTHORS:20170427-151420554
Persistent URL:
Official Citation:Herbert Pablo, N. D. Richardson, J. Fuller, J. Rowe, A. F. J. Moffat, R. Kuschnig, A. Popowicz, G. Handler, C. Neiner, A. Pigulski, G. A. Wade, W. Weiss, B. Buysschaert, T. Ramiaramanantsoa, A. D. Bratcher, C. J. Gerhartz, J. J. Greco, K. Hardegree-Ullman, L. Lembryk, W. L. Oswald; The most massive heartbeat: an in-depth analysis of ι Orionis. Mon Not R Astron Soc 2017; 467 (2): 2494-2503. doi: 10.1093/mnras/stx207
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77024
Deposited By: Ruth Sustaita
Deposited On:28 Apr 2017 16:05
Last Modified:15 Nov 2021 17:04

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