Query : 2008A&A...480..563D

2008A&A...480..563D - Astronomy and Astrophysics, volume 480, 563-571 (2008/3-3)

Extrasolar planet detection by binary stellar eclipse timing: evidence for a third body around CM Draconis.


Abstract (from CDS):

Our objective is to elucidate the physical process that causes the observed observed-minus-calculated (O-C) behavior in the M4.5/M4.5 binary CM Dra and to test for any evidence of a third body around the CM Dra system. New eclipse minimum timings of CM Dra were obtained between the years 2000 and 2007. The O-C times of the system are fitted against several functions, representing different physical origins of the timing variations. Using our observational data in conjunction with published timings going back to 1977, a clear non-linearity in O-C times is apparent. An analysis using model-selection statistics gives about equal weight to a parabolic and to a sinusoidal fitting function. Attraction from a third body, either at large distance in a quasi-constant constellation across the years of observations or from a body on a shorter orbit generating periodicities in O-C times is the most likely source of the observed O-C times. The white dwarf GJ 630.1B, a proper motion companion of CM Dra, can however be rejected as the responsible third body. Also, no further evidence of the short-periodic planet candidate described by Deeg et al. (2000A&A...358L...5D) is found, whereas other mechanisms, such as period changes from stellar winds or Applegate's mechanism can be rejected. A third body, being either a few-Jupiter-mass object with a period of 18.5±4.5years or an object in the mass range of 1.5Mjup to 0.1M with periods of hundreds to thousands of years is the most likely origin of the observed minimum timing behavior.

Abstract Copyright:

Journal keyword(s): stars: individual: CM Dra - stars: binaries: eclipsing - eclipses - stars: planetary systems

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 PSR B1257+12 Psr 13 00 03.1075 +12 40 55.155           ~ 519 1
2 V* CM Dra BY* 16 34 20.3302660573 +57 09 44.368918696   14.50 12.87 10.85 9.26 M4.5V 443 0
3 EGGR 258 WD* 16 34 21.5518633862 +57 10 08.868180953       14.770   DQ8 123 0
4 HD 202206c Pl 21 14 57.7686051936 -20 47 21.161521320           ~ 45 1
5 HD 202206 PM* 21 14 57.7686051936 -20 47 21.161521320   8.79 8.07     G6V 234 1
6 HD 202206b Pl 21 14 57.7686051936 -20 47 21.161521320           ~ 57 1
7 V* V391 Peg HS* 22 04 12.1045050096 +26 25 07.819080600   14.41 14.61 15.00   sdB 110 2

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