J/ApJ/927/135 Spitzer/IRAC fluxes of the HD 166191 system (Su+, 2022)
A star-sized impact-produced dust clump in the terrestrial zone of the
HD 166191 system.
Su K.Y.L., Kennedy G.M., Schlawin E., Jackson A.P., Rieke G.H.
<Astrophys. J., 927, 135 (2022)>
=2022ApJ...927..135S 2022ApJ...927..135S
ADC_Keywords: Photometry, infrared; Stars, F-type
Keywords: Infrared excess ; Circumstellar matter ; Debris disks ;
Extrasolar rocky planets ; Exoplanet migration
Abstract:
We report on five years of 3-5µm photometry measurements obtained
by warm Spitzer to track the dust debris emission in the terrestrial
zone of HD 166191 in combination with simultaneous optical data. We
show that the debris production in this young (∼10Myr) system
increased significantly in early 2018 and reached a record high level
(almost double by mid 2019) by the end of the Spitzer mission (early
2020), suggesting intense collisional activity in its terrestrial zone
likely due to either initial assembling of terrestrial planets through
giant impacts or dynamical shake-up from unseen planet-mass objects or
recent planet migration. This intense activity is further highlighted
by detecting a star-size dust clump, passing in front of the star, in
the midst of its infrared brightening. We constrain the minimum size
and mass of the clump using multiwavelength transit profiles and
conclude that the dust clump is most likely created by a large impact
involving objects of several hundred kilometers in size with an
apparent period of 142 days (i.e., 0.62au, assuming a circular orbit).
The system's evolutionary state (right after the dispersal of its
gas-rich disk) makes it extremely valuable to learn about the process
of terrestrial-planet formation and planetary architecture through
future observations.
Description:
Warm Spitzer observations were obtained under GO programs PID 11093,
13014, and 14266 (PI Su) with data covering from 2015 June to the end
of the Spitzer mission in 2020 January. HD 166191 has two Spitzer
visibility windows per year, each a total of ∼39days in length. During
each visibility window, a cadence of 3±1days was used to monitor the
system. A total of 126 sets of observations at both 3.6 and 4.5um
bands were obtained.
Objects:
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RA (ICRS) DE Designation(s)
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18 10 30.33 -23 34 00.2 HD 166191 = TYC 6843-1557-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 84 126 The IRAC fluxes of the HD 166191 system
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See also:
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
J/A+A/409/169 : UBVRI light curves of AA Tau in 1999 (Bouvier+, 2003)
J/MNRAS/363/1111 : Tycho-2 stars with IR excess (Clarke+, 2005)
J/ApJ/620/1010 : Spitzer 24µm photometry of A dwarfs (Rieke+, 2005)
J/ApJ/653/675 : Spitzer 24µm photometry of A dwarfs (Su+, 2006)
J/ApJ/698/1989 : Spitzer survey of NGC 2451 (Balog+, 2009)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/ApJ/832/87 : Members of the young open cluster IC 2395 (Balog+, 2016)
J/ApJ/836/34 : 24um excesses & membership of NGC2244 (Meng+, 2017)
J/A+A/609/A116 : Low extinction TGAS HR Catalogue (Ruiz-Dern+, 2018)
J/AJ/157/202 : IRAC fluxes of the ID8 and P1121 systems (Su+, 2019)
J/MNRAS/496/3257 : The ASAS-SN cat. of variable stars - VIII (Bredall+, 2020)
J/ApJ/898/21 : Spitzer/IRAC obs. of HD113766 & HD172555 systems (Su+, 2020)
J/AJ/161/36 : Exoplanets in habitable zone with Kepler (Bryson+, 2021)
J/ApJ/923/90 : LCOGT V-band monitoring of TYC 8830 410 1 (Melis+, 2021)
J/ApJ/918/71 : Spitzer/IRAC phot. of V488 Persei debris disk (Rieke+, 2021)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- AOR [53405952/69992704] Spitzer AOR key
11- 21 F11.5 d BMJD3.6 [57187.57/58874.8] Barycentric Julian Date of
3.6um flux observation
23- 29 F7.2 mJy F3.6 [651/1087] Spitzer/IRAC 3.6um band flux density
31- 34 F4.2 mJy e_F3.6 [1/8.5] Uncertainty in F3.6
36- 41 F6.2 mJy FIRE3.6 [167/604] Spitzer/IRAC 3.6um band excess flux
density, FIRE,3.6 (1)
43- 47 F5.2 mJy e_FIRE3.6 [7/12] Uncertainty in FIRE3.6
49- 59 F11.5 d BMJD4.5 [57187.57/58874.8] Barycentric Julian Date of
4.5um flux observation
61- 67 F7.2 mJy F4.5 [678/1155] Spitzer/IRAC 4.5um band flux density
69- 72 F4.2 mJy e_F4.5 [0.6/6.1] Uncertainty in F4.5
74- 79 F6.2 mJy FIRE4.5 [363/840] Spitzer/IRAC 4.5um band excess flux
density, FIRE,4.5 (1)
81- 84 F4.2 mJy e_FIRE4.5 [4/8] Uncertainty in FIRE4.5
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Note (1): The excess quantity excluding the star.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 16-Jan-2024