2019A&A...625L...6M

Query : 2019A&A...625L...6M

2019A&A...625L...6M - Astronomy and Astrophysics, volume 625L6-6 (2019/5-1)

Unexpectedly strong effect of supergranulation on the detectability of Earth twins orbiting Sun-like stars with radial velocities.

MEUNIER N. and LAGRANGE A.-M.

Abstract (from CDS):


Context. Magnetic activity and surface flows at different scales pertub radial velocity measurements. This affects the detectability of low-mass exoplanets.
Aims. In these flows, the effect of supergranulation is not as well characterized as the other flows, and we wish to estimate its effect on the detection of Earth-like planets in the habitable zone of Sun-like stars.
Methods. We produced time series of radial velocities due to oscillations, granulation, and supergranulation, and estimated the detection limit for a G2 star and a period of 300 days. We also studied in detail the behavior of the power when the signal of a 1MEarth planet was superposed on the signal from the stellar flows.
Results. We find that the detection rate does not reach 100% except for the supergranulation level we assume, which is still optimistic, and for an excellent sampling.
Conclusions. We conclude that with current knowledge, it is a very challenging task to find Earth twins around Sun-like stars with our current capabilities.

Abstract Copyright: © N. Meunier and A.-M. Lagrange 2019

Journal keyword(s): convection - techniques: radial velocities - stars: activity - stars: solar-type - Sun: granulation

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1352 1

Query : 2019A&A...625L...6M

Basic data :
* alf Cen A -- Spectroscopic Binary
Other object types: otypes_help 		* (2021MNRAS,HD,...), PM* (LFT,LHS,...), ** (**,CCDM,...), SB* (2004A&A,SBC7,...), UV (TD1), NIR (2MASS)
ICRS coord. (ep=J2000) : 		14 39 36.49400 -60 50 02.3737 (Optical) [ 34.18 28.46 90 ] A 2007A&A...474..653V
FK4 coord. (ep=B1950 eq=1950) : 		14 36 11.98699 -60 37 32.5863 [ 34.18 28.46 90 ]
Gal coord. (ep=J2000) : 		315.73417134 -00.67965625 [ 34.18 28.46 90 ]
Proper motions mas/yr : 		-3679.25 473.67 [3.89 3.24 0] A 2007A&A...474..653V
Radial velocity / Redshift / cz : 		V(km/s) -15.252000 [0.167000] / z(spectroscopic) -0.000051 [0.000001] / cz -15.25 [0.17]
   (Opt) A 2021MNRAS.506..150B
Parallaxes (mas): 		742.12 [1.40] A 1997A&A...323L..49P
Spectral type: 		G2V C 2006A&A...460..695T
Fluxes (6) :
U 0.96 [~] C 2002yCat.2237....0D
B 0.72 [~] C 2002yCat.2237....0D
V 0.01 [~] C 2002yCat.2237....0D
J -1.454 [0.133] C 2003yCat.2246....0C
H -1.886 [0.220] D 2003yCat.2246....0C
K -2.008 [0.260] D 2003yCat.2246....0C
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1
: 1 		: 1 Display criteria :

Identifiers (38) :
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HD 128620 GCRV 8517 2MASS J14393592-6050069 SKY# 26645
* alf Cen A GEN# +1.00128620A NAME Rigel Kentaurus SPOCS 610
* alf01 Cen GJ 559 A NAME Rigil Kentaurus TD1 17606
** RHD 1A HIC 71683 NLTT 37984 TIC 471011145
CCDM J14396-6050A HIP 71683 PLX 3309 TYC 9007-5849-1
CD-60 5293A HR 5459 PM 14362-6038A WDS J14396-6050A
CNS5 3627 IDS 14328-6025 A PMSC 14328-6025A WEB 12354
CPD-60 5483A LFT 1127 PPM 360911 Zkh 209
CSI-60 5483 41 LHS 50 SBC7 520
GALAH 140708001701306 LTT 5806 SBC9 815

References (1352 between 1850 and 2026) (Total 1352)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 15    Rot : 5    Fe/H : 60    Plx : 3    PM : 3    SpT : 11   

   

Observing logs
IUE : 175   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Link by name to the catalogue in VizieR :

HD 128620 CCDM J14396-6050A GALAH 140708001701306 GJ 559 A HIC 71683
HIP 71683 HR 5459 LHS 50 2MASS J14393592-6050069 NLTT 37984
PLX 3309 PPM 360911 TD1 17606 TYC 9007-5849-1 WDS J14396-6050A

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