2025AJ....169...24C

Query : 2025AJ....169...24C

2025AJ....169...24C - Astron. J., 169, 24 (2025/January-0)

Deep Learning-based Measurement of Planetary Radial Velocities in the Presence of Stellar Variability.

COLWELL I., TIMMARAJU V., VENKATARAM H.S. and WISE A.

Abstract (from CDS):

We present a deep learning-based approach for measuring small planetary radial velocities (RVs) in the presence of stellar variability. We use neural networks to reduce stellar RV jitter in 3 years of HARPS-N Sun-as-a-star spectra. We develop and compare dimensionality-reduction and data-splitting methods, as well as various neural network architectures including single-line convolutional neural networks (CNNs), an ensemble of single-line CNNs, and a multiline CNN. We inject planet-like RVs into the spectra and use the network to recover them. We find that the multiline CNN approach is able to recover 50 day period planets with 0.2 m s–1 semiamplitude, with 8.8% error in the amplitude, compared to 80% error in the amplitude using a traditional cross-correlation function approach. This approach shows promise for mitigating stellar RV variability and enabling the detection of small planetary RVs with unprecedented precision.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Radial velocity - Stellar activity - Neural networks

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 B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 1092 2

Query : 2025AJ....169...24C

Basic data :
* alf Cen B -- High Proper Motion Star
Other object types: otypes_help 		* (*,CD,...), PM* (LHS,LFT,...), ** (**,CCDM,...)
ICRS coord. (ep=J2000) : 		14 39 35.06311 -60 50 15.0992 (Optical) [ 180.22 171.39 90 ] A 2007A&A...474..653V
FK4 coord. (ep=B1950 eq=1950) : 		14 36 10.09948 -60 38 01.6746 [ 180.22 171.39 90 ]
Gal coord. (ep=J2000) : 		315.73008383 -00.68171325 [ 180.22 171.39 90 ]
Proper motions mas/yr : 		-3614.39 802.98 [20.48 19.52 0] A 2007A&A...474..653V
Radial velocity / Redshift / cz : 		V(km/s) -22.586 [0.0001] / z(spectroscopic) -0.000075 [0.000000] / cz -22.59 [0.00]
   (Opt) A 2018A&A...616A...7S
Parallaxes (mas): 		742.12 [1.40] A 1997A&A...323L..49P
Spectral type: 		K1V C 2006A&A...460..695T
Fluxes (6) :
U 2.89 [~] C 2002yCat.2237....0D
B 2.21 [~] C 2002yCat.2237....0D
V 1.33 [~] C 2002yCat.2237....0D
J -0.01 [~] C 2002yCat.2237....0D
H -0.49 [~] C 2002yCat.2237....0D
K -0.60 [~] C 2002yCat.2237....0D
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 : 1 Display criteria :

Identifiers (30) :
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LHS 51 GCRV 8518 LFT 1128 SPOCS 609
* alf Cen B GEN# +1.00128621 LTT 5807 TIC 471011144
* alf02 Cen GJ 559 B NAME Toliman TYC 9007-5848-1
** RHD 1B HD 128621 NLTT 37985 WDS J14396-6050B
CCDM J14396-6050B HIC 71681 PM 14362-6038B Zkh 210
CD-60 5293B HIP 71681 PMSC 14328-6025B [AOP94] 7
CPD-60 5483B HR 5460 RAVE J143935.1-605014
CSI-60 5483 42 IDS 14328-6025 B SKY# 26644

References (1092 between 1850 and 2026) (Total 1092)
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 : 16    Rot : 4    Fe/H : 49    Plx : 3    PM : 3    SpT : 3   

   

Observing logs
Herschel : 2    ISO : 11    IUE : 124   

   

External archives :

Link by name to the catalogue in VizieR :

LHS 51 CCDM J14396-6050B GJ 559 B HD 128621 HIC 71681
HIP 71681 HR 5460 NLTT 37985 RAVE J143935.1-605014 TYC 9007-5848-1
WDS J14396-6050B

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