2012MNRAS.422.1880O

Query : 2012MNRAS.422.1880O

2012MNRAS.422.1880O - Mon. Not. R. Astron. Soc., 422, 1880-1901 (2012/May-3)

On the theory of disc photoevaporation.

OWEN J.E., CLARKE C.J. and ERCOLANO B.

Abstract (from CDS):

We discuss a hydrodynamical model for the dispersal of protoplanetary discs around young, low-mass (<1.5 M☉) stars by photoevaporation from the central object's energetic radiation, which considers the far-ultraviolet (FUV) as well as the X-ray component of the radiation field. We present analytical scaling relations and derive estimates for the total mass-loss rates, as well as discussing the existence of similarity solutions for flows from primordial discs and discs with inner holes. Furthermore, we perform numerical calculations which span a wide range of parameter space and allow us to provide accurate scalings of the mass-loss rates with the physical parameters of the systems (X-ray and FUV luminosity, stellar mass, disc mass, disc temperature and inner hole radius).

The model suggests that the X-ray component dominates the photoevaporative mass-loss rates from the inner disc. The mass-loss rates have values in the range from 10–11 to 10–7 M☉/yr and scale linearly with X-ray luminosity, with only a weak dependence on the other parameters explored. However, in the case of high FUV-to-X-ray luminosity ratios (LFUV/LX> 100), the FUV constricts the X-ray flow and may dominate the mass loss.

Simulations of low-mass discs with inner holes demonstrate a further stage of disc clearing, which we call `thermal sweeping'. This process occurs when the mid-plane pressure drops to sufficiently low values. At this stage, a bound, warm, X-ray heated region becomes sufficiently large and unstable, such that the remaining disc material is cleared on approximately dynamical time-scales. This process significantly reduces the time taken to clear the outer regions of the disc, resulting in an expected transition disc population that will be dominated by accreting objects, as indicated by recent observations.


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): accretion, accretion discs - circumstellar matter - protoplanetary discs - planetary systems - stars: pre-main-sequence - X-rays: stars

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 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1

Query : 2012MNRAS.422.1880O

Basic data :
V* TW Hya -- T Tauri Star
Other object types: otypes_help 		* (2023A&A,CD,...), V* (ASAS,V*,...), IR (IRAS,PSCz,...), Em* (HBC,Hen), X (1RXP,1RXS), smm (JCMTSE,JCMTSF), TT* (1999AJ), Or* (2023A&A), Y*O (2016A&A), Y*? (2018A&A), PM* (PM), NIR (2MASS)
ICRS coord. (ep=J2000) : 		11 01 51.9053285064 -34 42 17.033218380 (Optical) [ 0.0098 0.0107 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		10 59 30.2196737783 -34 26 07.319138624 [ 0.0098 0.0107 90 ]
Gal coord. (ep=J2000) : 		278.6787338925561 +22.9546646644033 [ 0.0098 0.0107 90 ]
Proper motions mas/yr : 		-68.309 -13.900 [0.013 0.014 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 12.335 [0.0020] / z(spectroscopic) 0.000041 [0.000000] / cz 12.34 [0.00]
   (Opt) A 2018A&A...616A...7S
Parallaxes (mas): 		16.6289 [0.015] A 2020yCat.1350....0G
Spectral type: 		K6Ve C 2006A&A...460..695T
Fluxes (11) :
B 11.94 [0.12] D 2000A&A...355L..27H
V 10.50 [~] C 2002yCat.2237....0D
R 10.626 [0.05] D 2012yCat.1322....0Z
G 10.450887 [0.004428] C 2020yCat.1350....0G
I 9.18 [~] D 2006A&A...459..511B
J 8.217 [0.024] C 2003yCat.2246....0C
H 7.558 [0.042] C 2003yCat.2246....0C
K 7.297 [0.024] C 2003yCat.2246....0C
g 11.656 [0.12] E 2012yCat.1322....0Z
r 10.433 [0.07] D 2012yCat.1322....0Z
i 9.985 [0.07] D 2012yCat.1322....0Z
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 2
: 1 		: 1995 Display criteria :

Identifiers (31) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

CD-34 7151 IRAS 10594-3426 1RXP J110152.0-344212 V* TW Hya
AKARI-FIS-V1 J1101516-344214 JCMTSE J110152.0-344214 1RXS J110152.0-344212 [DML87] 277
ASAS J110152-3442.3 JCMTSF J110152.0-344214 SV* HV 4089 [TDQ2000] TRX 9
GSC 07208-00347 2MASS J11015191-3442170 TIC 49178630 AAVSO 1057-34
HBC 568 PDS 42 TWA 1 Gaia DR3 5401795662560500352
Hen 3-549 PM J11018-3442 TYC 7208-347-1 Gaia DR2 5401795662560500352
HIC 53911 PSCz P10594-3426 UCAC2 17035364 Gaia DR1 5401795658263638912
HIP 53911 RAVE J110151.9-344217 UCAC4 277-058769

References (2144 between 1850 and 2026) (Total 2144)
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 : 5    Diameter : 1    Distance : 4    Var : 3    Rot : 5    Fe/H : 4    Plx : 5    PM : 4    SpT : 6   

   

Observing logs
Herschel : 12    IUE : 19    XMM : 2   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : V* TW Hya

Link by name to the catalogue in VizieR :

CD-34 7151 AKARI-FIS-V1 J1101516-344214 GSC 07208-00347 HIC 53911 HIP 53911
IRAS 10594-3426 2MASS J11015191-3442170 RAVE J110151.9-344217 1RXS J110152.0-344212 TYC 7208-347-1
UCAC2 17035364 UCAC4 277-058769 V* TW Hya [DML87] 277 Gaia DR3 5401795662560500352
Gaia DR2 5401795662560500352 Gaia DR1 5401795658263638912

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