2012ApJ...751L..17M


Query : 2012ApJ...751L..17M

2012ApJ...751L..17M - Astrophys. J., 751, L17 (2012/May-3)

Variability of the infrared excess of extreme debris disks.

MENG H.Y.A., RIEKE G.H., SU K.Y.L., IVANOV V.D., VANZI L. and RUJOPAKARN W.

Abstract (from CDS):

Debris disks with extremely large infrared excesses (fractional luminosities >10–2) are rare. Those with ages between 30 and 130 Myr are of interest because their evolution has progressed well beyond that of protoplanetary disks (which dissipate with a timescale of order 3 Myr), yet they represent a period when dynamical models suggest that terrestrial planet building may still be progressing through large, violent collisions that could yield large amounts of debris and large infrared excesses. For example, our Moon was formed through a violent collision of two large protoplanets during this age range. We report two disks around the solar-like stars ID8 and HD 23514 in this age range where the 24 µm infrared excesses vary on timescales of a few years, even though the stars are not variable in the optical. Variations this rapid are difficult to understand if the debris is produced by collisional cascades, as it is for most debris disks. It is possible that the debris in these two systems arises in part from condensates from silicate-rich vapor produced in a series of violent collisions among relatively large bodies. If their evolution is rapid, the rate of detection of extreme excesses would indicate that major collisions may be relatively common in this age range.

Abstract Copyright:

Journal keyword(s): circumstellar matter - infrared: stars - planets and satellites: formation - stars: individual (2MASS J08090250-4858172, HD 23514)

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 BD+20 307 SB* 01 54 50.3440413288 +21 18 22.461011784   9.57 9.01     G0 101 0
2 HD 15407 PM* 02 30 50.6559832920 +55 32 54.256925724   7.43 6.95     F5V 74 0
3 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3208 0
4 HD 23514 * 03 46 38.3922026460 +22 55 11.199934340 9.95 9.93 9.43 8.96 8.84 F5V 121 0
5 2MASS J08090250-4858172 Y*O 08 09 02.5063872816 -48 58 17.289559668     13.13 12.73 12.32 G6-G7 30 0
6 NGC 2547 OpC 08 09 52.360 -49 10 35.01           ~ 362 0

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2022.08.12-07:49:15

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