J/ApJ/744/138 Calibrated visibilities of ε Eri (Baines+, 2012)
Confirming fundamental properties of the exoplanet host star ε Eridani
using the Navy Optical Interferometer.
Baines E.K., Armstrong J.T.
<Astrophys. J., 744, 138 (2012)>
=2012ApJ...744..138B 2012ApJ...744..138B
ADC_Keywords: Interferometry ; Stars, double and multiple ; Planets
Keywords: planetary systems - stars: individual (HD 22049) -
techniques: high angular resolution - techniques: interferometric
Abstract:
We measured the angular diameter of the exoplanet host star ε
Eridani using the Navy Optical Interferometer. We determined its
physical radius, effective temperature, and mass by combining our
measurement with the star's parallax, photometry from the literature,
and the Yonsei-Yale isochrones, respectively. We used the resulting
stellar mass of 0.82±0.05M☉ plus the mass function from
Benedict et al. to calculate the planet's mass, which is
1.53±0.22MJupiter. Using our new effective temperature, we also
estimated the extent of the habitable zone for the system.
Description:
Observations were obtained using the Navy Optical Interferometer
(NOI), an interferometer, with 550-850nm wavelength range, located on
Anderson Mesa, AZ. ε Eri was observed over three nights in
2010 (Nov 18 and 30 and Dec 08) using baseline lengths from 19 to 79m
(see Table 2).
Objects:
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RA (2000) DE Designation(s)
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03 32 55.84 -09 27 29.7 ε Eridani = V* eps Eri = HD 22049
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 47 429 Calibrated visibilities of ε Eri
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See also:
J/ApJ/612/481 : Optical brightness of epsilon Eri dust ring (Proffitt+, 2004)
J/ApJ/701/1922 : Radio interferometric planet search. I. (Bower+, 2009)
J/ApJ/694/1085 : Radii of exoplanet host stars (van Belle+, 2009)
J/ApJ/649/1010 : Habitability of known exoplanetary systems (Jones+, 2006)
J/ApJ/646/505 : Catalog of nearby exoplanets (Butler+, 2006)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 "DD/MMM/YYYY" Date Date of the Observation
13- 20 F8.3 d JD [5518/5539] Julian Date (JD-2450000)
22- 28 F7.3 10+6/rad SFreq [38.8/118.6] Spatial Frequency; in
units of 106 cycles/radian (1)
30- 35 F6.3 --- V2 [-0.038/0.752] Visibility squared (see eq.1)
37- 41 F5.3 --- e_V2 The 1σ error in V2
43- 47 A5 --- Name Baseline Name (AC-E6, AC-W7, AE-W7 or
E6-W7) (2)
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Note (1): Spatial frequency is a function of wavelength and baseline.
Note (2): The Navy Optical Interferometer (NOI) consists of two nested arrays:
the four stations of the astrometric array (AC, AE, AW, and AN, which
stand for Astrometric Center, East, West, and North, respectively) and
the six stations of the imaging array, of which two stations (E6 and
W7) are currently in operation.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 20-Jun-2013