J/A+A/566/A35 Radial velocities of HD 41248 (Santos+, 2014)
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.Zh.,
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., Udry S.
<Astron. Astrophys. 566, A35 (2014)>
=2014A&A...566A..35S 2014A&A...566A..35S
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities
Keywords: planetary systems - stars: individual: HD 41248 - stars: solar-type -
stars: activity - stars: abundances - surveys
Abstract:
The search for planets orbiting metal-poor stars is of uttermost
importance for our understanding of the 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, HD
41248 is a metal-poor, solar-type star on 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).
In the present paper we present a new planet search program that is
using the HARPS spectrograph to search for Neptunes and Super-Earths
orbiting a sample of metal-poor FGK dwarfs. We then present a detailed
analysis of an additional 162 radial velocity measurements of HD
41248, obtained within this program, with the goal of confirming the
existence of the proposed planetary system.
We analyzed 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
previously announced. One of the signals, with a period of ∼25 days,
is shown to be related to the rotational period of the star, and is
clearly seen in some of the activity proxies. The remaining signal
(P∼18 days) could not be convincingly retrieved in the new data set.
We discuss possible causes for the complex (evolving) signals observed
in the data of HD 41248, proposing that they may 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.
Description:
Table 1 contains the list of stars in the sample, their V magnitudes,
and coordinates (2000.0 equinox).
Table hd41248 contains the radial velocities of HD41248.
Objects:
-------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------
06 00 32.78 -56 09 42.6 HD 41248 = HIP 28460
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 109 Sample overview
hd41248.dat 30 156 Radial velocities of HD41248
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See also:
J/A+A/469/L43 : Radial velocities of Gl 581 (Udry+, 2007)
J/A+A/474/293 : Radial velocities of GJ 674 (Bonfils+, 2007)
J/A+A/493/639 : Velocity curves of HD 40307 (Mayor+, 2009)
J/A+A/493/645 : Gl 176 radial velocities (Forveille+, 2009)
J/A+A/496/513 : RV of 6 stars with long-period giant planets (Moutou+, 2009)
J/A+A/496/521 : Radial velocities of HD45364 (Correia+, 2009)
J/A+A/496/527 : Radial velocity curves of HD 47186 & HD 181433 (Bouchy+, 2009)
J/A+A/507/487 : GJ 581 radial velocity curve (Mayor+, 2009)
J/A+A/511/A21 : Radial velocities of GJ876 planetary system (Correia+, 2010)
J/A+A/512/A46 : Radial velocities of BD-08 2823 (Hebrard+, 2010)
J/A+A/512/A47 : Radial velocities of 3 stars with giant planets (Santos+ 2010)
J/A+A/512/A48 : HD125612, HD215497, HIP5158 HARPS RV curves (Lo Curto+, 2010)
J/A+A/523/A15 : HARPS XXIII: RV data for the 8 targets (Naef+, 2010)
J/A+A/526/A111 : Radial velocity of HD 85390, 90156, 103197 (Mordasini+, 2011)
J/A+A/526/A112 : Radial velocities of HARPS metal-poor sample (Santos+, 2011)
J/A+A/526/A141 : Velocity monitoring of Gl 676A and HIP 12961 (Forveille+ 2011)
J/A+A/527/A63 : 7 new HARPS planetary systems RV (Moutou+, 2011)
J/A+A/528/A112 : Radial velocities of HD 10180 (Lovis+, 2011)
J/A+A/551/A59 : HD103774, HD109271 and BD-061339 RV curves (Lo Curto+, 2013)
J/A+A/556/A110 : HARPS radial velocities of GJ 163 (Bonfils+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star name
11- 14 F4.2 mag Vmag Absolute V magnitude
16- 17 I2 h RAh Right Ascension J2000 (hours)
19- 20 I2 min RAm Right Ascension J2000 (minutes)
22- 26 F5.2 s RAs Right Ascension J2000 (seconds)
28 A1 --- DE- Declination J2000 (sign)
29- 30 I2 deg DEd Declination J2000 (degrees)
32- 33 I2 arcmin DEm Declination J2000 (minutes)
35- 39 F5.2 arcsec DEs Declination J2000 (seconds)
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Byte-by-byte Description of file: hd41248.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d BJD [52943/56633] Barycentric Julian date
(BJD-2400000)
15- 21 F7.5 km/s RV Radial velocity
24- 30 F7.5 km/s e_RV Error radial velocity
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Acknowledgements:
Nuno C. Santos, Nuno.Santos(at)astro.up.pt
References:
Pepe et al., Paper I 2004A&A...423..385P 2004A&A...423..385P
Santos et al., Paper II 2004A&A...426L..19S 2004A&A...426L..19S
Lovis et al., Paper III 2005A&A...437.1121L 2005A&A...437.1121L
Moutou et al., Paper IV 2005A&A...439..367M 2005A&A...439..367M
Udry et al., Paper V 2006A&A...447..361U 2006A&A...447..361U
Bonfils et al., Paper VI 2005A&A...443L..15B 2005A&A...443L..15B
Lo Curto et al., Paper VII 2006A&A...451..345L 2006A&A...451..345L
Pepe et al., Paper VIII 2007A&A...462..769P 2007A&A...462..769P
Naef et al., Paper IX 2007A&A...470..721N 2007A&A...470..721N
Bonfils et al., Paper X 2007A&A...474..293B 2007A&A...474..293B, Cat. J/A+A/474/293
Udry et al., Paper XI 2007A&A...469L..43U 2007A&A...469L..43U, Cat. J/A+A/469/L43
Santos et al., Paper XII 2007A&A...474..647S 2007A&A...474..647S
Mayor et al., Paper XIII 2009A&A...493..639M 2009A&A...493..639M, Cat. J/A+A/493/639
Forveille et al., Paper XIV 2009A&A...493..645F 2009A&A...493..645F, Cat. J/A+A/493/645
Moutou et al., Paper XV 2009A&A...496..513M 2009A&A...496..513M, Cat. J/A+A/496/513
Correia et al., Paper XVI 2009A&A...496..521C 2009A&A...496..521C, Cat. J/A+A/496/521
Bouchy et al., Paper XVII 2009A&A...496..527B 2009A&A...496..527B, Cat. J/A+A/496/527
Mayor et al., Paper XVIII 2009A&A...507..487M 2009A&A...507..487M, Cat. J/A+A/507/487
Correia et al., Paper XIX 2010A&A...511A..21C 2010A&A...511A..21C, Cat. J/A+A/511/A21
Hebrard et al., Paper XX 2010A&A...512A..46H 2010A&A...512A..46H, Cat. J/A+A/512/A46
Santos et al., Paper XXI 2010A&A...512A..47S 2010A&A...512A..47S, Cat. J/A+A/512/A47
Lo Curto et al., Paper XXII 2010A&A...512A..48L 2010A&A...512A..48L, Cat. J/A+A/512/A48
Naef et al., Paper XXIII 2010A&A...523A..15N 2010A&A...523A..15N, Cat. J/A+A/523/A15
Mordasini et al., Paper XXIV 2011A&A...526A.111M 2011A&A...526A.111M, Cat. J/A+A/526/A111
Santos et al., Paper XXV 2011A&A...526A.112S 2011A&A...526A.112S, Cat. J/A+A/526/A112
Forveille et al., Paper XXVI 2011A&A...526A.141F 2011A&A...526A.141F, Cat. J/A+A/526/A141
Moutou et al., Paper XXVII 2011A&A...527A..63M 2011A&A...527A..63M, Cat. J/A+A/527/A63
Lovis et al., Paper XXVIII 2011A&A...528A.112L 2011A&A...528A.112L, Cat. J/A+A/528/A112
Dumusque et al., Paper XXX 2011A&A...535A..55D 2011A&A...535A..55D, Cat. J/A+A/535/A55
Bonfils et al., Paper XXXI 2013A&A...549A.109B 2013A&A...549A.109B
Lo Curto et al., Paper XXXII 2013A&A...551A..59L 2013A&A...551A..59L, Cat. J/A+A/551/A59
Delfosse et al., Paper XXXIII 2013A&A...553A...8D 2013A&A...553A...8D
Bonfils et al., Paper XXXIV 2013A&A...556A.110B 2013A&A...556A.110B, Cat. J/A+A/556/A110
(End) Nuno C. Santos [CAUP-Porto, Portugal], Patricia Vannier [CDS] 25-Apr-2014