J/ApJS/263/31 Gaia stellar flyby analysis for spiral arm hosts (Shuai+, 2022)
Stellar flyby analysis for spiral arm hosts with Gaia DR3.
Shuai L., Ren B.B., Dong R., Zhou X., Pueyo L., De Rosa R.J., Fang T.,
Mawet D.
<Astrophys. J. Suppl. Ser., 263, 31 (2022)>
=2022ApJS..263...31S 2022ApJS..263...31S
ADC_Keywords: Stars, diameters; Stars, distances; YSOs; Infrared sources;
Optical; Surveys
Keywords: Protoplanetary disks ; Coronagraphic imaging ;
Planetary system formation
Abstract:
Scattered-light imaging studies have detected nearly two dozen spiral
arm systems in circumstellar disks, yet the formation mechanisms for
most of them are still under debate. Although existing studies can use
motion measurements to distinguish leading mechanisms such as
planet-disk interaction and disk self-gravity, close-in stellar flybys
can induce short-lived spirals and even excite arm-driving planets
into highly eccentric orbits. With unprecedented stellar location and
proper-motion measurements from Gaia Data Release 3 (DR3), here we
study for known spiral arm systems their flyby history with their
stellar neighbors by formulating an analytical on-sky flyby framework.
For stellar neighbors currently located within 10pc of the spiral
hosts, we restrict the flyby time to within the past 104yr and the
flyby distance to within 10 times the disk extent in scattered light.
Among a total of 12570 neighbors that are identified in Gaia DR3 for
20 spiral systems, we do not identify credible flyby candidates for
isolated systems. Our analysis suggests that a close-in recent flyby
is not the dominant formation mechanism for isolated spiral systems in
scattered light.
Description:
We retrieve the public SPHERE/IRDIS (Infra-Red Dual-beam Imager and
Spectrograph) observations in polarimetric imaging mode from the
Very Large Telescope (VLT) at the European Southern Observatory (ESO)
data archive as of 2022 May 24.
From all the reduction results, we identify 20 systems that host
spiral arms: AB Aur, AS 205, CQ Tau, DR Tau, DZ Cha, EM* SR 21,
HD34282, HD 34700, HD 100453, HD 100546, HD 142527, HD 143006,
LkHa330, MWC 758, SAO 206462 (HD 135344 B), TWA 7, V599 Ori,
V1247 Ori, Wa Oph 6, and WW Cha.
See Section 2.1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 50 20 Summary of flyby information for 20 spiral hosts
table2.dat 108 12590 Flyby history of the 20 source neighbors
using Gaia DR3
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See also:
B/eso : ESO Science Archive Catalog (ESO, 1991-2022)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/A+A/458/173 : Optical spectroscopy of 253 IRAS sources (Suarez+, 2006)
J/ApJ/703/1964 : Spectra of three nearby star-forming regions (Furlan+, 2009)
J/ApJ/783/121 : BANYAN II. Nearby young assoc. cand. members (Gagne+, 2014)
J/ApJ/786/97 : Photospheric properties of T Tauri stars (Herczeg+, 2014)
J/AJ/153/188 : Spectroscopy of the foreground pop. in Orion A (Fang+, 2017)
J/AJ/153/95 : Catalog of Suspected Nearby Young Stars (Riedel+, 2017)
J/ApJ/856/23 : BANYAN. XI. The BANYAN Σ algorithm (Gagne+, 2018)
J/ApJ/898/L38 : VLT/SPHERE Y-band images of MWC 758 at two epochs (Ren+, 2020)
J/AJ/163/219 : Gaia DR2 stellar flybys in the Sco-Cen OB assoc. (Ma+, 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Host Spiral host name
12- 14 I3 AU Rdisk [17/438] Approximate disk radius in scattered
light matching field of view in Figure 1
16- 19 I4 --- Nbr [201/1973] Number of neighboring stars in Gaia
DR3 with location and proper-motion measurements
within 10pc
21- 22 I2 --- Nf [2/28] Number of neighboring stars whose closest
approach to the host is within 104yr before
Gaia DR3
24- 29 I6 AU Dca [203/945081] Expectation for closest on-sky
approach distance in the frequentist approach (1)
31- 34 I4 AU e_Dca [0/2892] Standard deviation in Dca
36- 43 F8.2 --- zScore [1.5/14326] Minimum z-score for the closest
approaches of all neighbors (1) (2)
45- 48 F4.2 --- RUWE [0.9/3.7] RUWE of the host star in Gaia DR3
50 A1 --- f_RUWE [b] Flag on RUWE (3)
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Note (1): The closest-approach distance and minimum z-score do not have to be
of the same neighbor. If this is indeed the case, the z-score for the
closest approach is higher, which makes it even less likely for the
neighbor to pass through the spiral host.
Note (2): Minimum z-score for the closest approaches of all neighbors, which
is defined as the expectation of closest approach by its corresponding
standard deviation; the resulting value is thus unitless or the
meaning of σ in astronomy.
Note (3): Flag as follows:
b = The RUWE is expected to be around 1.0 for sources for which the
single-star model provides a good fit to the astrometric observations.
A RUWE value that is significantly greater than 1.0 (e.g., RUWE>1.4;
Fabricius+ 2021A&A...649A...5F 2021A&A...649A...5F) suggests that the source is nonsingle or
otherwise problematic for the astrometric solution, which would induce
biased flyby calculations in our framework.
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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- 10 A10 --- Host Stellar identifier
12- 19 A8 --- --- [Gaia DR3]
21- 39 I19 --- Gaia Gaia DR3 unique source designation
41- 51 F11.2 AU Dca [0/11021317] Closest approach distance (1)
53- 60 F8.2 AU e_Dca [0/24144] Standard deviation in Dclose
62- 70 F9.2 AU Tca [-10000/0] Closest approach time (1)
72- 84 F13.2 --- zScore [1.5/2882927057]? The z-score (Dca/e_Dca)
86- 93 F8.4 deg RAdeg [54.4/257.1] Right Ascension (ICRS) at Ep=2016.0
95-102 F8.4 deg DEdeg [-84.4/34.2] Declination (ICRS) at Ep=2016.0
104-108 F5.2 --- RUWE [0.6/49] Gaia DR3 Renormalised Unit Weight Error
for each source
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Note (1): Within the past 104yr.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Jan-2023