2016A&A...587A..34V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST22:46:06

2016A&A...587A..34V - Astronomy and Astrophysics, volume 587A, 34-34 (2016/3-1)

Eclipsing time variations in close binary systems: Planetary hypothesis vs. Applegate mechanism.

VOELSCHOW M., SCHLEICHER D.R.G., PERDELWITZ V. and BANERJEE R.

Abstract (from CDS):

The observed eclipsing time variations in post-common-envelope binaries (PCEBs) can be interpreted as potential evidence for massive Jupiter-like planets, or as a result of magnetic activity, leading to quasi-periodic changes in the quadrupole moment of the secondary star. The latter is commonly referred to as the Applegate mechanism. We employ an improved version of Applegate's model including the angular momentum exchange between a finite shell and the core of the star. The framework is employed to derive the general conditions under which the Applegate mechanism can work, and is subsequently applied to a sample of 16 close binary systems with potential planets, including eleven PCEBs. Further, we present a detailed derivation and study of analytical models that allow for an straightforward extension to other systems. Using our full numerical framework, we show that the Applegate mechanism can clearly explain the observed eclipsing time variations in four of the systems, while the required energy to produce the quadrupole moment variations is too high in at least eight systems. In the remaining four systems, the required energy is comparable to the available energy produced by the stars, which we consider borderline cases. Therefore, the Applegate mechanism cannot uniquely explain the observed period time variations for this entire population. Even in systems where the required energy is too high, the Applegate mechanism may provide an additional scatter, which needs to be considered in the derivation and analysis of planetary models.

Abstract Copyright:

Journal keyword(s): stars: activity - binaries: eclipsing - stars: interiors - planetary systems - stars: AGB and post-AGB - planets and satellites: detection

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* UZ For AM* 03 35 28.6515678221 -25 44 21.765602833           M4.5 245 0
2 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.63   5.4   K2:Vnk 1124 0
3 V* V471 Tau Al* 03 50 24.9664598642 +17 14 47.433240686   10.258 9.373   8.393 K2V+DA 615 0
4 V* RR Cae WD* 04 21 05.5631969817 -48 39 07.062891386 14.50 14.92 14.40     DA7.8 134 1
5 V* V470 Cam HS* 07 10 42.0512018720 +66 55 43.520280054           sdB+dM 92 1
6 V* RU Cnc RS* 08 37 30.1264408516 +23 33 41.643015668   10.80 10.20 10.019   G9V+F9V 115 0
7 V* DP Leo AM* 11 17 15.9238061197 +17 57 41.680410866           ~ 210 1
8 BD-07 3477 HS* 12 44 20.2386520980 -08 40 16.848587212   10.46 10.594 10.895   sdB2VIIHe3 249 1
9 V* NY Vir HS* 13 38 48.1466489725 -02 01 49.209465866   13.43 13.66 13.75   sdB1VIIHe1 191 1
10 V* QS Vir WD* 13 49 52.0031855330 -13 13 37.001934702 14.27 14.98 14.40 14.37   DA3+dM 122 1
11 V* NN Ser No* 15 52 56.1202658103 +12 54 44.432043501     16.51     DAO1+M4 232 0
12 V* BX Dra RR* 16 06 17.3672247442 +62 45 46.089700113   11.00 10.62     A3 53 0
13 V* AW Her RS* 18 25 38.7221269349 +18 17 40.207883327   10.52 9.69 7.94 8.537 G0 78 0
14 V* V1828 Aql HS* 20 20 00.4586719589 +04 37 56.519765906   12.9   13.34   sdOB+dM 54 1
15 V* HU Aqr AM* 21 07 58.1945403160 -05 17 40.557984218   15.1   15.4   D+M4V 256 1
16 V* SZ Psc RS* 23 13 23.7750023418 +02 40 31.587196900   8.19 7.44   6.390 G5Vp 302 1

    Equat.    Gal    SGal    Ecl

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2020.07.13-22:46:06

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