2006A&A...449.1219G


Query : 2006A&A...449.1219G

2006A&A...449.1219G - Astronomy and Astrophysics, volume 449, 1219-1232 (2006/4-3)

About putative Neptune-like extrasolar planetary candidates.

GOZDZIEWSKI K. and MIGASZEWSKI C.

Abstract (from CDS):

We re-analyze the precision radial velocity (RV) data of HD 208487 by the Anglo-Australian Planet Search Team, HD 190360, HD 188015, HD 114729 by the California and Carnegie Planet Search Team, and HD 147513 by the Geneva Planet Search Team. All these stars are supposed to host Jovian companions in long-period orbits. We test a hypothesis that the residuals of the 1-planet model of the RV or an irregular scatter of the measurements around the synthetic RV curve may be explained by the existence of additional planets in short-period orbits. We performed a global search for the best fits in the orbital parameters space with genetic algorithms and simplex method. This makes it possible to verify and extend the results with an application of commonly used FFT-based periodogram analysis for identifying the leading periods. Our analysis confirms the presence of a periodic component in the RV of HD 190360 that may correspond to a hot-Neptune planet. We found four new cases in which the 2-planet model yields significantly better fits to the RV data than the best 1-planet solutions. If the periodic variability of the residuals of single-planet fits indeed has a planetary origin, then hot-Neptune planets may exist in these extrasolar systems. We estimate their orbital periods as in the range of 7-20d and minimal masses of about 20 masses of the Earth.

Abstract Copyright:

Journal keyword(s): planetary systems - stars: individual: HD 208487 - stars: individual: HD 190360 - stars: individual: HD 188015 - stars: individual: HD 114729 - stars: individual: HD 147513

Simbad objects: 13

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Number of rows : 13
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 * 94 Cet PM* 03 12 46.4365677072 -01 11 45.955808988   5.631 5.070     F8.5V 425 1
2 HD 73526 PM* 08 37 16.4833548528 -41 19 08.790456324   9.69 9.00     G6V 177 2
3 * rho01 Cnc PM* 08 52 35.8111044043 +28 19 50.954994470 7.45 6.82   5.4   K0IV-V 1036 1
4 Ross 905 PM* 11 42 11.0933350978 +26 42 23.650782778   12.06 10.613 10.272 8.24 M3V 568 1
5 HD 114729 PM* 13 12 44.2591958183 -31 52 24.055985573   7.31 6.69     G0V 176 1
6 HD 121504 PM* 13 57 17.2387351056 -56 02 24.159656364   8.12 7.52     G2V 157 1
7 HD 128311 BY* 14 36 00.5602765558 +09 44 47.454573266 9.232 8.441 7.446 6.895 6.425 K3V 287 1
8 HD 147513 PM* 16 24 01.2911377368 -39 11 34.729913940 6.17 6.02 5.376     G5V 326 1
9 * mu. Ara PM* 17 44 08.7031414872 -51 50 02.591603160   5.85 5.15     G3IV-V 497 2
10 HD 188015 PM* 19 52 04.5426976824 +28 06 01.345077360   8.95 8.23     G5IV 84 1
11 HD 190360 PM* 20 03 37.4050868074 +29 53 48.492435887   6.44   5.2   G7IV-V 414 1
12 HD 208487 PM* 21 57 19.8476861856 -37 45 49.045448556   8.02 7.47     G1/3(V) 107 1
13 BD-15 6290 BY* 22 53 16.7325836486 -14 15 49.304052185 12.928 11.749 10.192 9.013 7.462 M3.5V 922 1

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2022.05.21-15:20:40

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