The University of Southampton
University of Southampton Institutional Repository

The evolutionary status of cataclysmic variables: Eclipse modelling of 15 systems

The evolutionary status of cataclysmic variables: Eclipse modelling of 15 systems
The evolutionary status of cataclysmic variables: Eclipse modelling of 15 systems

We present measurements of the component masses in 15 Cataclysmic Variables (CVs) - 6 new estimates and 9 improved estimates. We provide new calibrations of the relationship between superhump period excess and mass ratio, and use this relation to estimate donor star masses for 225 superhumping CVs. With an increased sample of donor masses we revisit the implications for CV evolution. We confirm the high mass of white dwarfs in CVs, but find no trend in white dwarf mass with orbital period. We argue for a revision in the location of the orbital period minimum of CVs to 79.6±0.2min, significantly shorter than previous estimates. We find that CV donors below the gap have an intrinsic scatter of only 0.005 R around a common evolutionary track, implying a correspondingly small variation in angular momentum loss (AML) rates. In contrast to prior studies, we find that standard CV evolutionary tracks - without additional AML - are a reasonable fit to the donor masses just below the period gap, but that they do not reproduce the observed period minimum, or fit the donor radii below 0.1M.

Binaries: close, Binaries: eclipsing, Novae, cataclysmic variables, Stars: dwarf novae, Stars: evolution, White dwarfs
0035-8711
5535-5551
McAllister, M.
0896e208-e02f-4f99-a6d3-3dc03f96d4a3
Littlefair, S. P.
d831fa9b-f1f5-4e14-b3fa-0e7fa6f5b365
Parsons, S. G.
e6f8679e-db5a-4b44-9a25-c9e014cee380
Dhillon, V. S.
8a4c9a0c-87a7-44a9-ac04-4fbab8662c1d
Marsh, T. R.
9bb19766-4a1d-4f18-b137-4731ae347638
Gänsicke, B. T.
20806b60-c78c-466d-9384-4cd19507cc68
Breedt, E.
8a142b4e-67c2-4d4e-a7d5-9d179a63b2ec
Copperwheat, C.
19d38baf-98fd-4c58-9fe3-24a5da787baf
Green, M. J.
c28e0886-52a6-4926-aeb0-07c49760d7a9
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Sahman, D. I.
a2a291c4-7fd2-4365-a4d4-11e6305ec56a
Dyer, Martin J.
1610918c-a452-434b-a101-fd71570b8da9
Kerry, P.
ffadbc6f-b17b-435f-8f11-e9a482fee8b1
Ashley, R. P.
9d432117-f394-4b22-8eaa-a99650dff59f
Irawati, P.
00f08d1a-b260-420f-8504-31abb6889c2f
Rattanasoon, S.
18325c5a-9592-43ef-8491-33c7bb62966a
McAllister, M.
0896e208-e02f-4f99-a6d3-3dc03f96d4a3
Littlefair, S. P.
d831fa9b-f1f5-4e14-b3fa-0e7fa6f5b365
Parsons, S. G.
e6f8679e-db5a-4b44-9a25-c9e014cee380
Dhillon, V. S.
8a4c9a0c-87a7-44a9-ac04-4fbab8662c1d
Marsh, T. R.
9bb19766-4a1d-4f18-b137-4731ae347638
Gänsicke, B. T.
20806b60-c78c-466d-9384-4cd19507cc68
Breedt, E.
8a142b4e-67c2-4d4e-a7d5-9d179a63b2ec
Copperwheat, C.
19d38baf-98fd-4c58-9fe3-24a5da787baf
Green, M. J.
c28e0886-52a6-4926-aeb0-07c49760d7a9
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Sahman, D. I.
a2a291c4-7fd2-4365-a4d4-11e6305ec56a
Dyer, Martin J.
1610918c-a452-434b-a101-fd71570b8da9
Kerry, P.
ffadbc6f-b17b-435f-8f11-e9a482fee8b1
Ashley, R. P.
9d432117-f394-4b22-8eaa-a99650dff59f
Irawati, P.
00f08d1a-b260-420f-8504-31abb6889c2f
Rattanasoon, S.
18325c5a-9592-43ef-8491-33c7bb62966a

McAllister, M., Littlefair, S. P., Parsons, S. G., Dhillon, V. S., Marsh, T. R., Gänsicke, B. T., Breedt, E., Copperwheat, C., Green, M. J., Knigge, C., Sahman, D. I., Dyer, Martin J., Kerry, P., Ashley, R. P., Irawati, P. and Rattanasoon, S. (2019) The evolutionary status of cataclysmic variables: Eclipse modelling of 15 systems. Monthly Notices of the Royal Astronomical Society, 486 (4), 5535-5551. (doi:10.1093/mnras/stz976).

Record type: Article

Abstract

We present measurements of the component masses in 15 Cataclysmic Variables (CVs) - 6 new estimates and 9 improved estimates. We provide new calibrations of the relationship between superhump period excess and mass ratio, and use this relation to estimate donor star masses for 225 superhumping CVs. With an increased sample of donor masses we revisit the implications for CV evolution. We confirm the high mass of white dwarfs in CVs, but find no trend in white dwarf mass with orbital period. We argue for a revision in the location of the orbital period minimum of CVs to 79.6±0.2min, significantly shorter than previous estimates. We find that CV donors below the gap have an intrinsic scatter of only 0.005 R around a common evolutionary track, implying a correspondingly small variation in angular momentum loss (AML) rates. In contrast to prior studies, we find that standard CV evolutionary tracks - without additional AML - are a reasonable fit to the donor masses just below the period gap, but that they do not reproduce the observed period minimum, or fit the donor radii below 0.1M.

Text
stz976 - Version of Record
Available under License Other.
Download (3MB)

More information

Accepted/In Press date: 1 April 2019
e-pub ahead of print date: 24 April 2019
Published date: July 2019
Additional Information: This article has been accepted for publication in Monthly Notices of Royal Astronomical Society ©: 2019 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Keywords: Binaries: close, Binaries: eclipsing, Novae, cataclysmic variables, Stars: dwarf novae, Stars: evolution, White dwarfs

Identifiers

Local EPrints ID: 432543
URI: http://eprints.soton.ac.uk/id/eprint/432543
ISSN: 0035-8711
PURE UUID: 405d1b35-ec70-4213-85c8-e50b4eaf4a68

Catalogue record

Date deposited: 17 Jul 2019 16:31
Last modified: 06 Oct 2020 21:55

Export record

Altmetrics

Contributors

Author: M. McAllister
Author: S. P. Littlefair
Author: S. G. Parsons
Author: V. S. Dhillon
Author: T. R. Marsh
Author: B. T. Gänsicke
Author: E. Breedt
Author: C. Copperwheat
Author: M. J. Green
Author: C. Knigge
Author: D. I. Sahman
Author: Martin J. Dyer
Author: P. Kerry
Author: R. P. Ashley
Author: P. Irawati
Author: S. Rattanasoon

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×