J/A+A/682/A61 M512 ALMA B3 and B6 images (Cacciapuoti+, 2024)
A dusty streamer infalling onto the disk of a class I protostar.
ALMA dual-band constraints on grain properties and mass infall rate.
Cacciapuoti L., Macias E., Gupta A., Testi L., Miotello A., Espaillat C.,
Kuffmeier M., van Terwisga S., Tobin J., Grant S., Manara C.F.,
Segura-Cox D., Wendeborn J., Klessen R.S., Maury A.J., Lebreuilly U.,
Hennebelle P., Molinari S.
<Astron. Astrophys. 682, A61 (2024)>
=2024A&A...682A..61C 2024A&A...682A..61C (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Interferometry ; Radio sources
Keywords: planets and satellites: formation - circumstellar matter -
stars: low-mass - planetary systems - dust, extinction -
radio continuum: ISM
Abstract:
Observations of interstellar material infalling onto star- and
planet-forming systems have become increasingly common thanks to
recent advancements in radio interferometry. These structures
replenish disks with fresh material, have the potential to
significantly alter their dynamics, trigger the formation of
substructures, induce shocks, and modify their physical and chemical
properties. In this study, we combine new ALMA band 3 and archival
band 6 observations to characterize the dust content and mass infall
rate of a 4000au arc-like structure infalling onto M512, a class I
young stellar object located in the Lynds 1641 region of the Orion A
molecular cloud. We measure for the first time spectral index maps and
derive a dust opacity index profile along a streamer, constraining
grain properties and its dust mass. We measure a spectral index
α∼3.2 across the entire structure, and a dust opacity index
β∼1.6. Given grain properties consistent with the measured
β, the structure can host up to 245M⊕ of dust, being
comparable or even exceeding the mass of the inner, unresolved 600au,
which contains the protoplanetary disk of M512. Such a massive
streamer can strongly affect the evolution of the star- and
planet-forming inner system. Assuming typical ISM dust-to-gas ratio of
1%, free fall timescales (50kyr) imply total mass infall rates up to
1.5*10-6M☉/yr. M512 has been classified as an outbursting
source with multi epoch photometry, thus representing an interesting
case study to explore the possible connection between infalling
streamers and accretion outbursts.
Description:
Continuum ALMA images produced for the paper of the protostar M512 in
Orion. The paper studies the extended dust emission around the young
protostar. Uploaded files have been calibrated, reduced and imaged
uniformly and smoothed to match spatial resolution.
Objects:
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RA (2000) DE Designation(s)
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05 40 13.789 -07 32 16.03 M512 = [MGM2012] 512
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 125 2 List of fits images
fits/* . 2 Individual fits images
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See also:
J/AJ/144/192 : Spitzer survey of Orion A and B. I. YSO catalog (Megeath+, 2012)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 50 A23 "datime" Obs.date Observation date
52- 59 F8.4 GHz Freq Observed frequency
61- 63 I3 Kibyte size Size of FITS file
65-102 A38 --- FileName Name of FITS file, in subdirectory fits
104-125 A22 --- Title Title of the FITS file
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Acknowledgements:
Luca Cacciapuoti, luca.cacciapuoti(at)eso.org
(End) Patricia Vannier [CDS] 24-Nov-2023