2011A&A...535A..55D


Query : 2011A&A...535A..55D

2011A&A...535A..55D - Astronomy and Astrophysics, volume 535A, 55-55 (2011/11-1)

The HARPS search for southern extra-solar planets. XXX. Planetary systems around stars with solar-like magnetic cycles and short-term activity variation.

DUMUSQUE X., LOVIS C., SEGRANSAN D., MAYOR M., UDRY S., BENZ W., BOUCHY F., LO CURTO G., MORDASINI C., PEPE F., QUELOZ D., SANTOS N.C. and NAEF D.

Abstract (from CDS):

We present the discovery of four new long-period planets within the HARPS high-precision sample: HD 137388b (Msini=0.22MJ), HD 204941b (Msini=0.27MJ), HD 7199b (Msini=0.29MJ), HD 7449b (Msini=1.04MJ). A long-period companion, probably a second planet, is also found orbiting HD 7449. Planets around HD 137388, HD 204941, and HD 7199 have rather low eccentricities (less than 0.4) relative to the 0.82 eccentricity of HD 7449b. All these planets were discovered even though their hosting stars have clear signs of activity. Solar-like magnetic cycles, characterized by long-term activity variations, can be seen for HD 137388, HD 204941 and HD 7199, whereas the measurements of HD 7449 reveal a short-term activity variation, most probably induced by magnetic features on the stellar surface. We confirm that magnetic cycles induce a long-term radial velocity variation and propose a method to reduce considerably the associated noise. The procedure consists of fitting the activity index and applying the same solution to the radial velocities because a linear correlation between the activity index and the radial velocity is found. Tested on HD 137388, HD 204941, and HD 7199, this correction reduces considerably the stellar noise induced by magnetic cycles and allows us to derive precisely the orbital parameters of planetary companions.

Abstract Copyright:

Journal keyword(s): planetary systems - techniques: radial velocities - stars: individual: HD 7199 - stars: individual: HD 7449 - stars: individual: HD 137388 - stars: individual: HD 204941

VizieR on-line data: <Available at CDS (J/A+A/535/A55): stars.dat table4.dat table5.dat table6.dat table7.dat>

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 7199 PM* 01 10 47.2210199784 -66 11 17.388251628   8.89 8.03     K1IV 73 1
2 HD 7199b Pl 01 10 47.2213949949 -66 11 17.390096250           ~ 8 1
3 HD 7449c Pl 01 14 29.3222250437 -05 02 50.614804562           ~ 8 1
4 HD 7449b Pl 01 14 29.3222250437 -05 02 50.614804562           ~ 21 1
5 HD 7449 PM* 01 14 29.3222869752 -05 02 50.614788804   8.08 7.48     F9.5V 95 2
6 HD 10180h Pl 01 37 53.5773715933 -60 30 41.485438420           ~ 17 1
7 HD 10180g Pl 01 37 53.5773715933 -60 30 41.485438420           ~ 18 1
8 HD 85390b Pl 09 50 02.4969205710 -49 47 24.957628041           ~ 9 1
9 HD 137388b Pl 15 35 39.9207645417 -80 12 16.538435367           ~ 7 1
10 HD 137388 PM* 15 35 39.9216221928 -80 12 16.537858920   9.59 8.70 8.42 8.37 K2IV 61 1
11 HD 204941 PM* 21 32 23.5097206385 -20 57 26.718667631   9.39 8.48     K2V 77 1
12 HD 204941b Pl 21 32 23.5099500012 -20 57 26.719628458           ~ 8 1

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2022.08.09-12:06:29

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