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# Chandra X-ray constraints on the candidate Ca-rich gap transient SN 2016hnk

Sell, P.H., Arur, K., Maccarone, T.J., Kotak, R., Knigge, C., Sand, D.J. and Valenti, S. (2018) Chandra X-ray constraints on the candidate Ca-rich gap transient SN 2016hnk. Monthly Notices of the Royal Astronomical Society: Letters, 475 (1), L111-L115.

Record type: Article

## Abstract

We present a Chandra observation of SN 2016hnk, a candidate Ca-rich gap transient. This observation was specifically designed to test whether or not this transient was the result of the tidal detonation of a white dwarf by an intermediate-mass black hole. Since we detect no X-ray emission 28 days after the discovery of the transient, as predicted from fall-back accretion, we rule out this model. Our upper limit of $\sim 10$ M$_\odot$ does not allow us to rule out a neutron star or stellar-mass black hole detonator due limits on the sensitivity of Chandra to soft X-rays and unconstrained variables tied to the structure of super-Eddington accretion disks. Together with other Chandra and multiwavelength observations, our analysis strongly argues against the intermediate-mass black hole tidal detonation scenario for Ca-rich gap transients more generally.

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pdf - Author's Original

Submitted date: 7 December 2017
Accepted/In Press date: 16 January 2018
e-pub ahead of print date: 19 January 2018
Keywords: astro-ph.HE

## Identifiers

Local EPrints ID: 416482
URI: http://eprints.soton.ac.uk/id/eprint/416482
ISSN: 1745-3925

## Catalogue record

Date deposited: 20 Dec 2017 17:30

## Contributors

Author: P.H. Sell
Author: K. Arur
Author: T.J. Maccarone
Author: R. Kotak
Author: C. Knigge
Author: D.J. Sand
Author: S. Valenti