2019AJ....157..204D

Query : 2019AJ....157..204D

2019AJ....157..204D - Astron. J., 157, 204-204 (2019/May-0)

Deriving iodine-free spectra for high-resolution echelle spectrographs.

DIAZ M.R., SHECTMAN S.A., BUTLER R.P. and JENKINS J.S.

Abstract (from CDS):

We describe a new method to derive clean, iodine-free spectra directly from observations acquired using high-resolution echelle spectrographs equipped with iodine cells. The main motivation to obtain iodine-free spectra is to use portions of the spectrum that are superimposed with the dense forest of iodine absorption lines, in order to retrieve lines that can be used to monitor the magnetic activity of the star, helping to validate candidate planets. In short, we provide a straightforward methodology to clean the spectra using the forward model used to derive radial velocities, the line spread function information plus the stellar spectrum without iodine to reconstruct and subtract the iodine spectrum from the observations. We show our results using observations of the star τ Ceti acquired with the Planet Finder Spectrograph (PFS), High Resolution Echelle Spectrometer (HIRES), and University College London Echelle Spectrograph (UCLES), reaching an iodine-free spectrum correction at the ∼1% rms level. We additionally discuss the limitations and further applications of the method.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): instrumentation: spectrographs - methods: observational - stars: activity - techniques: radial velocities - techniques: spectroscopic

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 * tau Cet PM* 01 44 04.0831371922 -15 56 14.927607677 4.43 4.22 3.50 2.88 2.41 G8V 1354 1

Query : 2019AJ....157..204D

Basic data :
* tau Cet -- High Proper Motion Star
Other object types: otypes_help 		* (2021MNRAS,*,...), PM* (LHS,Ci,...), ** (CCDM,IDS,...), IR (IRAS,IRC,...), Ro* (1996ApJ), X (1RXS), UV (TD1), NIR (2MASS)
ICRS coord. (ep=J2000) : 		01 44 04.0831371922 -15 56 14.927607677 (Optical) [ 0.1187 0.0832 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		01 41 44.6585540211 -16 12 00.599873755 [ 0.1187 0.0832 90 ]
Gal coord. (ep=J2000) : 		173.1006757445964 -73.4397246835404 [ 0.1187 0.0832 90 ]
Proper motions mas/yr : 		-1721.728 854.963 [0.181 0.088 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -16.597 [0.0002] / z(spectroscopic) -0.000055 [0.000000] / cz -16.60 [0.00]
   (Opt) A 2018A&A...616A...7S
Parallaxes (mas): 		273.8097 [0.1701] A 2020yCat.1350....0G
Spectral type: 		G8V B 1989ApJS...71..245K
Fluxes (9) :
U 4.43 [~] C 2002yCat.2237....0D
B 4.22 [~] C 2002yCat.2237....0D
V 3.50 [~] C 2002yCat.2237....0D
R 2.88 [~] C 2002yCat.2237....0D
G 3.300400 [0.002966] C 2020yCat.1350....0G
I 2.41 [~] C 2002yCat.2237....0D
J 2.14 [~] C 2002yCat.2237....0D
H 1.72 [~] C 2002yCat.2237....0D
K 1.68 [~] C 2002yCat.2237....0D
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Hierarchy : number of linked objects
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: 7 		Display criteria :

Identifiers (56) :
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LHS 146 GJ 71 N30 359 SKY# 2598
* tau Cet GJ 71.0 NLTT 5787 SPOCS 96
* 52 Cet HD 10700 8pc 274.17 TD1 997
BD-16 295 HIC 8102 PLX 365 TIC 419015728
CCDM J01441-1557A HIP 8102 PLX 365.00 TYC 5855-2292-1
Ci 20 124 HR 509 PMC 90-93 41 UBV 1769
CNS5 448 IDS 01394-1628 A PM 01417-1612 UBV M 8397
CSI-16 295 1 IRAS 01416-1611 PPM 210580 uvby98 100010700
FK5 59 IRC -20018 RAFGL 4135S WDS J01441-1556A
GALAH 140708006401203 JP11 535 RAVE J014404.1-155615 WEB 1733
GC 2123 LFT 159 ROT 249 YZ 106 431
GCRV 979 LPM 84 1RXS J014404.7-155632 Zkh 33
GEN# +1.00010700 LTT 935 SACS 31 Gaia DR3 2452378776434477184
GES J01440247-1556034 2MASS J01440402-1556141 SAO 147986 Gaia DR2 2452378776434276992

References (1354 between 1850 and 2026) (Total 1354)
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 : 26    Distance : 2    Var : 1    Rot : 22    Fe/H : 116    Plx : 5    PM : 8    SpT : 34   

   

Observing logs
Herschel : 7    ISO : 11    IUE : 21   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : * tau Cet

Link by name to the catalogue in VizieR :

LHS 146 BD-16 295 CCDM J01441-1557A FK5 59 GALAH 140708006401203
GJ 71 GJ 71.0 HD 10700 HIC 8102 HIP 8102
HR 509 IRAS 01416-1611 IRC -20018 2MASS J01440402-1556141 NLTT 5787
PLX 365 PPM 210580 RAFGL 4135S RAVE J014404.1-155615 1RXS J014404.7-155632
SAO 147986 TD1 997 TYC 5855-2292-1 uvby98 100010700 WDS J01441-1556A
Gaia DR3 2452378776434477184 Gaia DR2 2452378776434276992

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