Title:	Indication of a massive circumbinary planet orbiting the Low Mass X-ray Binary MXB 1658-298.
Authors:	Jain, Chetana Paul, Biswajit Sharma, Rahul Jaleel, Abdul Dutta, Anjan
Keywords:	planet star interactions eclipsing stars
Issue Date:	Jun-2017
Publisher:	Oxford University Press for The Royal Astronomical Society
Citation:	Monthly Notices of the Royal Astronomical Society Letters , 2017, Vol. 468, L118-L122
Abstract:	We present an X-ray timing analysis of the transient X-ray binary MXB 1658−298, using data obtained from the RXTE and XMM–Newton observatories. We have made 27 new mid-eclipse time measurements from observations made during the two outbursts of the source. These new measurements have been combined with the previously known values to study long-term changes in orbital period of the binary system. We have found that the mid-eclipse timing record of MXB 1658−298 is quite unusual. The long-term evolution of mid-eclipse times indicates an overall orbital period decay with a time-scale of –6.5(7) × 107 yr. Over and above this orbital period decay, the O−C residual curve also shows a periodic residual on shorter time-scales. This sinusoidal variation has an amplitude of ∼9 lt-s and a period of ∼760 d. This is indicative of the presence of a third body around the compact X-ray binary. The mass and orbital radius of the third body are estimated to lie in the ranges 20.5–26.9 Jupiter mass and 750–860 lt-s, respectively. If true, then it will be the most massive circumbinary planet and also the smallest period binary known to host a planet.
Description:	Open Access
URI:	http://hdl.handle.net/2289/6801
ISSN:	1745-3933 (online) 1745-3925
Alternative Location:	http://adsabs.harvard.edu/abs/2017MNRAS.468L.118J http://arxiv.org/abs/1703.04433 http://dx.doi.org/10.1093/mnrasl/slx039
Copyright:	2017 The authors & the Royal Astronomical Society.
Appears in Collections:	Research Papers (A&A)

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