SIMBAD references

2014A&A...566A..35S - Astronomy and Astrophysics, volume 566A, 35-35 (2014/6-1)

The HARPS search for southern extra-solar planets. XXXV. The interesting case of HD 41248 : stellar activity, no planets ?

SANTOS N.C., MORTIER A., FARIA J.P., DUMUSQUE X., ADIBEKYAN V.Z., DELGADO-MENA E., FIGUEIRA P., BENAMATI L., BOISSE I., CUNHA D., GOMES DA SILVA J., LO CURTO G., LOVIS C., MARTINS J.H.C., MAYOR M., MELO C., OSHAGH M., PEPE F., QUELOZ D., SANTERNE A., SEGRANSAN D., SOZZETTI A., SOUSA S.G. and UDRY S.

Abstract (from CDS):

The search for planets orbiting metal-poor stars is of utmost importance for our understanding of planet formation models. However, no dedicated searches have been conducted so far for very low mass planets orbiting such objects. Only a few cases of low-mass planets orbiting metal-poor stars are thus known. Amongst these, HD41248 is a metal-poor, solar-type star on the orbit of which a resonant pair of super-Earth-like planets has been announced. This detection was based on 62 radial velocity measurements obtained with the HARPS spectrograph (public data). We present a new planet search program that is using the HARPS spectrograph to search for Neptunes and super-Earths that orbit a sample of metal-poor FGK dwarfs. We then present a detailed analysis of 162 additional radial velocity measurements of HD41248, obtained within this program, with the goal of confirming the existence of the proposed planetary system. We analysed the precise radial velocities, obtained with the HARPS spectrograph, together with several stellar activity diagnostics and line profile indicators. A careful analysis shows no evidence for the planetary system. One of the signals, with a period of ∼25days, is shown to be related to the rotational period of the star, and is clearly seen in some of the activity proxies. We were unable to convincingly retrieve the remaining signal (P∼18days) in the new dataset. We discuss possible causes for the complex (evolving) signals observed in the data of HD41248, proposing that they might be explained by the appearance and disappearance of active regions on the surface of a star with strong differential rotation, or by a combination of the sparse data sampling and active region evolution.

Abstract Copyright:

Journal keyword(s): planetary systems - stars: individual: HD 41248 - stars: solar-type - stars: activity - stars: abundances - surveys

VizieR on-line data: <Available at CDS (J/A+A/566/A35): table1.dat hd41248.dat>

Simbad objects: 110

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2014A&A...566A..35S and select 'bookmark this link' or equivalent in the popup menu


2020.01.21-07:12:52

© Université de Strasbourg/CNRS

    • Contact