J/ApJ/834/17 Mass & radius of planets, moons, low mass stars (Chen+, 2017)
Probabilistic forecasting of the masses and radii of other worlds.
Chen J., Kipping D.
<Astrophys. J., 834, 17-17 (2017)>
=2017ApJ...834...17C 2017ApJ...834...17C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, masses ; Stars, diameters ; Stars, double and multiple ;
Planets ; Models
Keywords: methods: statistics; planetary systems
Abstract:
Mass and radius are two of the most fundamental properties of an
astronomical object. Increasingly, new planet discoveries are being
announced with a measurement of one of these quantities, but not both.
This has led to a growing need to forecast the missing quantity using
the other, especially when predicting the detectability of certain
follow-up observations. We present an unbiased forecasting model built
upon a probabilistic mass-radius relation conditioned on a sample of
316 well-constrained objects. Our publicly available code, Forecaster,
accounts for observational errors, hyper-parameter uncertainties, and
the intrinsic dispersions observed in the calibration sample. By
conditioning our model on a sample spanning dwarf planets to late-type
stars, Forecaster can predict the mass (or radius) from the radius (or
mass) for objects covering nine orders of magnitude in mass.
Classification is naturally performed by our model, which uses four
classes we label as Terran worlds, Neptunian worlds, Jovian worlds,
and stars. Our classification identifies dwarf planets as merely
low-mass Terrans (like the Earth) and brown dwarfs as merely high-mass
Jovians (like Jupiter). We detect a transition in the mass-radius
relation at 2.0-0.6+0.7M⊕, which we associate with the
divide between solid, Terran worlds and Neptunian worlds. This
independent analysis adds further weight to the emerging consensus
that rocky super-Earths represent a narrower region of parameter space
than originally thought. Effectively, then, the Earth is the
super-Earth we have been looking for.
Description:
We performed a literature search for all objects within the range
M>2x1021kg and M<0.87M☉ (1.7x1030kg).
Solar system moons, planets, brown dwarfs and low-mass stars were
drawn from a variety of sources, which we list in Table 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 84 317 Masses and radii used for this study
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See also:
J/ApJ/825/19 : Mass-radius relationship for Rp<4 planets (Wolfgang+, 2016)
J/PASP/128/F4401 : Newly discovered planets from WASP-South (Turner+, 2016)
J/A+A/585/A126 : 3 irradiated & bloated hot Jupiters RV and phot. (West+, 2016)
J/AJ/150/168 : Spectroscopy & photom. for HAT-P-50--HAT-P-53 (Hartman+, 2015)
J/A+A/584/A72 : A rocky planet at 6.5pc from the Sun (Motalebi+ 2015)
J/AJ/150/33 : Photometry & spectroscopy of HATS-9 and HATS-10 (Brahm+, 2015)
J/A+A/579/A136 : HAT-P-36 and WASP-11/HAT-P-10 light curves (Mancini+, 2015)
J/A+A/575/A111 : GAPS V: Global analysis of the XO-2 system (Damasso+, 2015)
J/MNRAS/445/1114 : WASP-69b, WASP-70Ab and WASP-84b (Anderson+, 2014)
J/A+A/572/A93 : Four new transiting planets (Hebrard+, 2014)
J/MNRAS/444/776 : Transiting planets WASP-24, 25 and 26 (Southworth+, 2014)
J/MNRAS/440/1982 : WASP 95-101 transits (Hellier+, 2014)
J/AJ/147/94 : Solar neighborhood. XXXII. L and M dwarfs (Dieterich+, 2014)
J/ApJS/210/20 : Small Kepler planets radial velocities (Marcy+, 2014)
J/MNRAS/437/2831 : 4 transiting F-M binary systems (Zhou+, 2014)
J/A+A/551/A73 : RV for WASP-54b, WASP-56b and WASP-57b (Faedi+ 2013)
J/A+A/549/A134 : 4 new WASP transiting close-in giant planets (Hebrard+, 2013)
J/AJ/144/139 : HAT-P-39, HAT-P-40, and HAT-P-41 follow-up (Hartman+, 2012)
J/MNRAS/426/1291 : Physical properties of 38 exoplanets (Southworth, 2012)
J/MNRAS/426/739 : Velocities for 7 transiting hot Jupiters (Hellier+, 2012)
J/ApJ/757/112 : Stellar diameters. II. K and M-stars (Boyajian+, 2012)
J/ApJ/750/L37 : Stellar parameters of low-mass KOIs (Muirhead+, 2012)
J/ApJ/742/116 : Photometry of 4 massive transiting exoplanets (Bakos+, 2011)
J/ApJ/728/48 : Multicolor eclipse data for 6 new binaries (Kraus+, 2011)
J/ApJ/709/535 : Masses and radii of ecliping binaries (Brown, 2010)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)
http://www.astro.keele.ac.uk/jkt/tepcat/ : TEPCat: catalogue of transiting
planet properties
http://nssdc.gsfc.nasa.gov/planetary/factsheet/planet_table_ratio.html :
Planetary fact sheet
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 21 A21 --- Name Object Name
23- 32 F10.6 --- Mass [0.0003/318] Mass
34- 39 F6.4 --- e_Mass [0.0008/5]? Uncertainty in Mass
41- 44 A4 --- x_Mass Units for Mass (Mjup or Msun)
46- 52 F7.4 --- Rad [0.1/12] Radius
54- 59 F6.4 --- e_Rad [0.001/0.4]? Uncertainty in Rad
61- 64 A4 --- x_Rad Units for Radius (Rsun, Rjup or Rgeo)
66- 84 A19 --- Ref Reference (1)
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Note (1): References are given as ADS bibliographic codes, exactly as provided
by the author, except:
GPMP = Sheppard, S. S. 2016, The Giant Planet & Moon Page,
http://www.dtm.ciw.edu/users/sheppard/satellites/
Accessed: 2016-01-28
NPFS = Williams, D. R. 2016, NASA Planetary Fact Sheet
http://nssdc.gsfc.nasa.gov/planetary/factsheet/planet_table_ratio.html
Accessed: 2016-01-28
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 17-May-2017