J/ApJ/805/77 Spitzer 3.6 and 4.5um monitoring of 5 stars (Meng+, 2015)
Planetary collisions outside the solar system: time domain characterization
of extreme debris disks.
Meng H.Y.A., Su K.Y.L., Rieke G.H., Rujopakarn W., Myers G., Cook M.,
Erdelyi E., Maloney C., McMath J., Persha G., Poshyachinda S.,
Reichart D.E.
<Astrophys. J., 805, 77 (2015)>
=2015ApJ...805...77M 2015ApJ...805...77M
ADC_Keywords: Photometry, infrared ; Stars, double and multiple
Keywords: circumstellar matter; infrared: planetary systems;
planets and satellites: dynamical evolution and stability;
stars: individual: (2MASS J08090250-4858172, 2MASS J07354269-1450422,
HD 15407A, HD 23514, HD 145263, BD+20 307)
Abstract:
Luminous debris disks of warm dust in the terrestrial planet zones
around solar-like stars were recently found to vary, which is
indicative of ongoing large-scale collisions of rocky objects. We use
Spitzer 3.6 and 4.5um time-series observations in 2012 and 2013
(extended to 2014 in one case) to monitor five more debris disks with
unusually high fractional luminosities ("extreme debris disk"),
including P1121 in the open cluster M47 (80 Myr), HD15407A in the
AB Dor moving group (80Myr), HD 23514 in the Pleiades (120Myr),
HD145263 in the Upper Sco Association (10Myr), and the field star
BD+20 307 (≳1Gyr). Together with the published results for ID8 in
NGC2547 (35Myr), this makes the first systematic time-domain
investigation of planetary impacts outside the solar system.
Significant variations with timescales shorter than a year are
detected in five out of the six extreme debris disks we monitored.
However, different systems show diverse sets of characteristics in the
time domain, including long-term decay or growth, disk temperature
variations, and possible periodicity.
Description:
New Spitzer observations analyzed in this work were conducted under
programs 80260 and 90192.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 73 16 Summary of Spitzer observations
table2.dat 43 242 Spitzer/IRAC photometry of the systems with extreme
debris disk
table6.dat 47 136 Optical monitoring of P1121
table7.dat 69 269 Optical monitoring of HD 15407A
table8.dat 69 455 Optical monitoring of HD 23514
table9.dat 68 238 Optical monitoring of BD+20 307
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See also:
J/ApJS/211/25 : Spitzer/IRS debris disk catalog. I. (Chen+, 2014)
J/AJ/147/82 : Monitoring of disk-bearing stars in NGC 2264 (Cody+, 2014)
J/ApJ/775/55 : Spitzer IR excesses in A-K stars (Ballering+, 2013)
J/ApJ/768/25 : Spitzer and Herschel obs. of debris disks (Gaspar+, 2013)
J/AJ/145/66 : Spitzer light curves of YSOs in IC 348 (Flaherty+, 2013)
J/ApJ/749/7 : RVs and EWs of the binary BD+20 307 (Fekel+, 2012)
J/ApJ/746/154 : Kinematic parallaxes for Sco-Cen members (Pecaut+, 2012)
J/ApJ/698/1989 : Spitzer survey of NGC 2451 (Balog+, 2009)
J/ApJ/688/1345 : Differential phot. of the SB* BD+20 307 (Zuckerman+, 2008)
J/ApJ/688/597 : Debris disks in NGC 2232 (Currie+, 2008)
J/PASP/120/1128 : Calibrated griz magnitudes of Tycho star (Ofek, 2008)
J/ApJS/175/191 : Variables from 2MASS calibration fields (Plavchan+, 2008)
J/ApJ/670/516 : NGC 2547 4.5-8um photometry (Gorlova+, 2007)
J/ApJ/653/675 : Spitzer 24µm photometry of A dwarfs (Su+, 2006)
J/ApJ/636/1098 : Debris disks around solar-type stars (Bryden+, 2006)
J/ApJ/620/1010 : Spitzer 24µm photometry of A dwarfs (Rieke+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- ID System identifier
10- 11 A2 --- m_ID System component
13 A1 --- f_ID [ab] Flag on ID (1)
15- 18 A4 --- SpT MK spectral type
20- 27 F8.3 mJy F3.6 [0.3/1259]? Spitzer/IRAC 3.6um stellar flux
29- 35 F7.3 mJy F4.5 [0.2/806]? Spitzer/IRAC 4.5um stellar flux
37- 38 A2 --- l_Age [≳ ] Limit flag on Age
39- 42 I4 Myr Age [10/1000]? Star age
44- 46 I3 pc Dist [55/490]? Distance
48- 49 I2 pc E_Dist [2/26]? Positive error on Dist
51- 52 I2 pc e_Dist [2/20]? Negative error on Dist
54- 60 F7.1 d BMJD1 ? Coverage (BMJD) - lower range
61 A1 --- --- [- ]
62- 68 F7.1 d BMJD2 ? Coverage (BMJD) - upper range
70- 73 A4 d Cad Cadence (2)
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Note (1): Flag as follows:
a = within aperture
b = Not an intended target. Listed only for reference of the photometry
of HD 23514A.
Note (2): Mean sampling interval. Numbers in parentheses denote the value
in the high cadence phase.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- ID System identifier
10- 11 A2 --- m_ID System component
13- 23 F11.5 d BMJD Barycentric, modified Julian Date (1)
25- 27 F3.1 um Band [3.6/4.5] Band used in the observation
29- 36 F8.3 mJy Flux [7.5/1601] Observed flux in Band
38- 43 F6.3 mJy e_Flux [0.01/14.7] The 1σ uncertainty in Flux
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Note (1): Corresponding to the mid-time of an exposure.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d BMJD Barycentric, modified Julian Date (1)
13- 16 A4 --- Filt Filter used in the observation
18- 22 F5.3 --- AirM [1/1.3] Airmass during observation
24- 28 F5.3 mag m1mag [0.5/0.7] Relative magnitude with respect to
comparison star P1225
30- 34 F5.3 mag e_m1mag [0.002/0.004] The 1σ uncertainty in m1mag
36- 41 F6.3 mag m2mag [-0.07/0.6]? Relative magnitude with respect to
check star TYC 5409-601-1
43- 47 F5.3 mag e_m2mag [0.002/0.006]? The 1σ uncertainty in m2mag
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Note (1): Corresponding to the mid-time of an exposure.
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Byte-by-byte Description of file: table[789].dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d BMJD Barycentric, modified Julian Date (1)
13- 18 A6 --- Filt Filter used in the observation (B, V or
"visual" (1 observation in table 7))
20- 24 F5.3 --- AirM [1/2.8]? Airmass during observation
26- 31 F6.3 mag mag [6.8/10.3] Apparent magnitude in Filt
33- 37 F5.3 mag e_mag [0.001/0.1] The 1σ uncertainty in mag
39- 53 A15 mag Comp1 Comparison star identifier (2)
55- 69 A15 mag Comp2 Check star identifier (2)
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Note (1): Corresponding to the mid-time of an exposure.
Note (2): An entry is left blank if a check star is not used or if a star used
is not in Table 5:
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Photometry reference stars
Source Telescope Coverage (BMJD) Filt Comparison Check
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P1121 CTIO 0.41m 56304.1-56317.1 V,Ic P1225 TYC 5409-601-1
PROMPT 5
56334.1-56355.1
HD 15407A AAVSO Network 56567.2-56659.2 B,V HD 15358 TYC 3691-1426-1
HD 15407 B
HD 23514AB AAVSO Network 56389.1-56399.1 V TYC 1800-2018-1 BD+22 552
56525.4-56675.1 B,V
BD+20 307AB AAVSO Network 56559.4-56659.2 B,V TYC 1212-374-1 TYC 1212-226-1
HR 577
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See the AAVSO database for more details.
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History:
From electronic version of the journal
(End) Prepared by AAS; Emmanuelle Perret [CDS] 08-Sep-2015