2012A&A...543A.138B


Query : 2012A&A...543A.138B

2012A&A...543A.138B - Astronomy and Astrophysics, volume 543A, 138-138 (2012/7-1)

The quest for companions to post-common envelope binaries. III. A reexamination of HW Virginis.

BEUERMANN K., DREIZLER S., HESSMAN F.V. and DELLER J.

Abstract (from CDS):

We report new mid-eclipse times of the short-period sdB/dM binary HW Virginis, which differ substantially from the times predicted by a previous model. The proposed orbits of the two planets in that model are found to be unstable. We present a new secularly stable solution, which involves two companions orbiting HW Vir with periods of 12.7yr and 55±15yr. For orbits coplanar with the binary, the inner companion is a giant planet with mass M3sini3≃14MJup and the outer one a brown dwarf or low-mass star with a mass of M4sini4= 30-120MJup. Using the mercury6 code, we find that such a system would be stable over more than 107yr, in spite of the sizeable interaction. Our model fits the observed eclipse-time variations by the light-travel time effect alone, without invoking any additional process, and provides support for the planetary hypothesis of the eclipse-time variations in close binaries. The signature of non-Keplerian orbits may be visible in the data.

Abstract Copyright:

Journal keyword(s): planets and satellites: detection - binaries: close - binaries: eclipsing - subdwarfs - stars: individual: HW Virginis

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* UZ For CV* 03 35 28.6518733656 -25 44 21.768755424           M4.5 257 0
2 V* RR Cae WD* 04 21 05.5631820426 -48 39 07.061113433 14.50 14.92 14.40     DA7.8 144 1
3 V* V470 Cam HS* 07 10 42.0513241680 +66 55 43.521505680           sdB+dM 103 1
4 V* DP Leo CV* 11 17 15.9239894616 +17 57 41.690453220           ~ 219 1
5 BD-07 3477 HS* 12 44 20.2386233232 -08 40 16.846099536   10.46 10.594 10.895   sdB2VIIHe3 270 1
6 V* NY Vir HS* 13 38 48.1466908176 -02 01 49.207286748   13.43 13.66 13.75   sdB1VIIHe1 209 1
7 V* QS Vir EB* 13 49 52.0029035208 -13 13 37.000132212 14.27 14.98 14.40 14.37   DA3+dM 128 1
8 V* NN Ser CV* 15 52 56.1203524080 +12 54 44.429312196     16.51     DAO1+M4 257 0
9 V* V1828 Aql HS* 20 20 00.4587151080 +04 37 56.517736296   12.9   13.34   sdOB+dM 64 1
10 V* HU Aqr CV* 21 07 58.1944529400 -05 17 40.557671916   16.198 15.814 14.891   D+M4V 264 1
11 HS 2231+2441 HS* 22 34 21.4832585640 +24 56 57.392918196     14.20     sdB+dM 45 1

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2022.11.28-09:17:31

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