2015A&A...584A..84P


Query : 2015A&A...584A..84P

2015A&A...584A..84P - Astronomy and Astrophysics, volume 584A, 84-84 (2015/12-1)

A maximum entropy approach to detect close-in giant planets around active stars.

PETIT P., DONATI J.-F., HEBRARD E., MORIN J., FOLSOM C.P., BOEHM T., BOISSE I., BORGNIET S., BOUVIER J., DELFOSSE X., HUSSAIN G., JEFFERS S.V., MARSDEN S.C. and BARNES J.R.

Abstract (from CDS):

The high spot coverage of young active stars is responsible for distortions of spectral lines that hamper the detection of close-in planets through radial velocity methods. We aim to progress towards more efficient exoplanet detection around active stars by optimizing the use of Doppler imaging in radial velocity measurements. We propose a simple method to simultaneously extract a brightness map and a set of orbital parameters through a tomographic inversion technique derived from classical Doppler mapping. Based on the maximum entropy principle, the underlying idea is to determine the set of orbital parameters that minimizes the information content of the resulting Doppler map. We carry out a set of numerical simulations to perform a preliminary assessment of the robustness of our method, using an actual Doppler map of the very active star HR 1099 to produce a realistic synthetic data set for various sets of orbital parameters of a single planet in a circular orbit. Using a simulated time series of 50 line profiles affected by a peak-to-peak activity jitter of 2.5km/s, in most cases we are able to recover the radial velocity amplitude, orbital phase, and orbital period of an artificial planet down to a radial velocity semi-amplitude of the order of the radial velocity scatter due to the photon noise alone (about 50m/s in our case). One noticeable exception occurs when the planetary orbit is close to co-rotation, in which case significant biases are observed in the reconstructed radial velocity amplitude, while the orbital period and phase remain robustly recovered. The present method constitutes a very simple way to extract orbital parameters from heavily distorted line profiles of active stars, when more classical radial velocity detection methods generally fail. It is easily adaptable to most existing Doppler imaging codes, paving the way towards a systematic search for close-in planets orbiting young, rapidly-rotating stars.

Abstract Copyright:

Journal keyword(s): planets and satellites: detection - stars: imaging - stars: rotation - stars: activity - planetary systems

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 - 2023
#notes
1 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.79 5.90 5.4   K2:Vnk 1152 0

Query : 2015A&A...584A..84P

Basic data :
HD 22468 -- RS CVn Variable
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
* (HD,AG,...), X (2015A&A,3A,...), ** (1997A&AS,**,...), SB* (CABS,CCABS,...), UV (2EUVE,EUVE,...), IR (AKARI,IRAS,...), Rad (NVSS,RGB,...), PM* (2000A&A,LSPM), V* (2012ApJ,V*), RS* (2013ApJS), gam (INTREF)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
03 36 47.2911034958 +00 35 15.938962144 (Optical) [ 0.0682 0.0542 90 ] A 2018yCat.1345....0G
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
03 34 13.1786424154 +00 25 33.124545924 [ 0.0682 0.0542 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
184.9112308047567 -41.5687380515822 [ 0.0682 0.0542 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
-32.894 -161.772 [0.131 0.118 90] A 2018yCat.1345....0G
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) -15.30 [0.1] / z(~) -0.000051 [0.000000] / cz -15.30 [0.10]
   A 2004MNRAS.349.1069K
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
33.7528 [0.0866] A 2018yCat.1345....0G
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
K2:Vnk C 2006AJ....132..161G
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (13) :
U 7.09 [~] C 2002yCat.2237....0D
B 6.79 [0.01] D 2000A&A...355L..27H
V 5.90 [0.01] D 2000A&A...355L..27H
R 5.4 [~] E 2003AJ....125..984M
G 5.6000 [0.0053] C 2018yCat.1345....0G
J 3.882 [0.318] D 2003yCat.2246....0C
H 3.246 [0.288] D 2003yCat.2246....0C
K 3.137 [0.344] D 2003yCat.2246....0C
u (AB) 11.733 [0.008] C 2009ApJS..182..543A
g (AB) 10.260 [0.007] C 2009ApJS..182..543A
r (AB) 9.555 [0.008] C 2009ApJS..182..543A
i (AB) 8.180 [0.008] C 2009ApJS..182..543A
z (AB) 9.389 [0.008] C 2009ApJS..182..543A
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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Identifiers (77) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 22468 EUVE J0336+00.5 PPM 146726 UCAC4 453-004886
** STF 422A GC 4311 RBS 449 USNO-B1.0 0905-00036210
3A 0335+001 GCRV 1996 2RE J033647+003535 uvby98 100022468 A
ADS 2644 A GEN# +1.00022468 2RE J0336+003 V* V711 Tau
AG+00 310 GSC 00064-01568 RE J033647+003525 WDS J03368+0035A
AKARI-IRC-V1 J0336472+003514 1H 0327+000 RE J0336+003 WEB 3204
ASCC 1100487 HD 22468A RGB J0336+005 WISE J033647.13+003516.3
AT 0339+063 HIC 16846 RX J0336.7+0035 2XMM J033647.2+003516
BD+00 616 HIP 16846 1RXS J033647.2+003518 1XRS 03362+010
BD+00 616A HR 1099 SAO 111291 XSS J03385+0029
CABS 29 IDS 03317+0016 A SBC7 131 YZ 0 769
CCABS 27 INTREF 156 SBC9 181 [ATZ98] A031
CCDM J03368+0035A IRAS 03342+0025 SDSS J033647.26+003515.2 [BM83] X0334+004
CSI+00 616 1 LSPM J0336+0035 SKY# 5466 [BSF97] J033647.4+003518
1E 0334.2+0025 2MASS J03364726+0035159 TD1 2351 [FS2003] 0137
2E 804 2MAXI J0336+006 TIC 311092804 [ZEH2003] RX J0336.7+0035 1
2E 0334.2+0025 NVSS J033647+003515 TYC 64-1568-1 Gaia DR2 3263936692671872384
1ES 0334+00.4 PLX 751 4U 0336+01
2EUVE J0336+00.6 PMSC 03317+0015Aab UBV 3453
EUVE J0336+00.6 PMSC 03317+0015A UBV M 9608

References (1152 between 1850 and 2023) (Total 1152)
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


velocities : 5    diameter : 1    distance : 1    ROT : 2    Fe_H : 5    PLX : 3    PM : 6    MK : 4   

   

Observing logs


herschel : 258    IUE : 376    XMM : 24   

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : HD 22468

Link by name to the catalogue in VizieR :

HD 22468 AG+00 310 AKARI-IRC-V1 J0336472+003514 BD+00 616 CABS 29
CCDM J03368+0035A 2E 804 EUVE J0336+00.6 EUVE J0336+00.5 GSC 00064-01568
HD 22468A HIC 16846 HIP 16846 HR 1099 IRAS 03342+0025
LSPM J0336+0035 2MASS J03364726+0035159 NVSS J033647+003515 PLX 751 PPM 146726
2RE J033647+003535 2RE J0336+003 1RXS J033647.2+003518 SAO 111291 SDSS J033647.26+003515.2
TD1 2351 TYC 64-1568-1 UCAC4 453-004886 USNO-B1.0 0905-00036210 uvby98 100022468 A
V* V711 Tau WDS J03368+0035A WISE J033647.13+003516.3 Gaia DR2 3263936692671872384

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2022.12.09-06:03:19

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