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

Chandra X-ray constraints on the candidate Ca-rich gap transient SN 2016hnk
Chandra X-ray constraints on the candidate Ca-rich gap transient SN 2016hnk
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.
astro-ph.HE
1745-3925
L111-L115
Sell, P.H.
7c75071e-87fe-4e4e-bf4b-82d51df2c16d
Arur, K.
c5315487-8445-4240-b87f-c64f3ace724d
Maccarone, T.J.
c2f1d87b-e2ef-4e33-b09f-a2861d917ea8
Kotak, R.
240df6f9-f459-47ea-9856-9664ccd9c98f
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Sand, D.J.
1d5b9338-c884-4586-bf6b-32902d9c3f3f
Valenti, S.
3a324949-946e-4b07-83ea-ba19d11bb91a
Sell, P.H.
7c75071e-87fe-4e4e-bf4b-82d51df2c16d
Arur, K.
c5315487-8445-4240-b87f-c64f3ace724d
Maccarone, T.J.
c2f1d87b-e2ef-4e33-b09f-a2861d917ea8
Kotak, R.
240df6f9-f459-47ea-9856-9664ccd9c98f
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Sand, D.J.
1d5b9338-c884-4586-bf6b-32902d9c3f3f
Valenti, S.
3a324949-946e-4b07-83ea-ba19d11bb91a

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. (doi:10.1093/mnrasl/sly011).

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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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

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Local EPrints ID: 416482
URI: http://eprints.soton.ac.uk/id/eprint/416482
ISSN: 1745-3925
PURE UUID: 7c89cade-7ad9-41eb-83cf-e6235c1613c4

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Date deposited: 20 Dec 2017 17:30
Last modified: 13 Mar 2019 19:04

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