# University of Hertfordshire

## ALMA survey of Class II protoplanetary disks in Corona Australis: a young region with low disk masses

Research output: Contribution to journalArticlepeer-review

### Standard

ALMA survey of Class II protoplanetary disks in Corona Australis : a young region with low disk masses. / Cazzoletti, P.; Manara, C. F.; Liu, H. B.; Dishoeck, E. F. van; Facchini, S.; Alcalà, J. M.; Ansdell, M.; Testi, L.; Williams, J. P.; Carrasco-González, C.; Dong, R.; Forbrich, J.; Fukagawa, M.; Galván-Madrid, R.; Hirano, N.; Hogerheijde, M.; Hasegawa, Y.; Muto, T.; Pinilla, P.; Takami, M.; Tamura, Motohide; Tazzari, M.; Wisniewski, J. P.

In: Astronomy & Astrophysics, 03.04.2019.

Research output: Contribution to journalArticlepeer-review

### Harvard

Cazzoletti, P, Manara, CF, Liu, HB, Dishoeck, EFV, Facchini, S, Alcalà, JM, Ansdell, M, Testi, L, Williams, JP, Carrasco-González, C, Dong, R, Forbrich, J, Fukagawa, M, Galván-Madrid, R, Hirano, N, Hogerheijde, M, Hasegawa, Y, Muto, T, Pinilla, P, Takami, M, Tamura, M, Tazzari, M & Wisniewski, JP 2019, 'ALMA survey of Class II protoplanetary disks in Corona Australis: a young region with low disk masses', Astronomy & Astrophysics.

### APA

Cazzoletti, P., Manara, C. F., Liu, H. B., Dishoeck, E. F. V., Facchini, S., Alcalà, J. M., Ansdell, M., Testi, L., Williams, J. P., Carrasco-González, C., Dong, R., Forbrich, J., Fukagawa, M., Galván-Madrid, R., Hirano, N., Hogerheijde, M., Hasegawa, Y., Muto, T., Pinilla, P., ... Wisniewski, J. P. (2019). ALMA survey of Class II protoplanetary disks in Corona Australis: a young region with low disk masses. Astronomy & Astrophysics.

### Vancouver

Cazzoletti P, Manara CF, Liu HB, Dishoeck EFV, Facchini S, Alcalà JM et al. ALMA survey of Class II protoplanetary disks in Corona Australis: a young region with low disk masses. Astronomy & Astrophysics. 2019 Apr 3.

### Author

Cazzoletti, P. ; Manara, C. F. ; Liu, H. B. ; Dishoeck, E. F. van ; Facchini, S. ; Alcalà, J. M. ; Ansdell, M. ; Testi, L. ; Williams, J. P. ; Carrasco-González, C. ; Dong, R. ; Forbrich, J. ; Fukagawa, M. ; Galván-Madrid, R. ; Hirano, N. ; Hogerheijde, M. ; Hasegawa, Y. ; Muto, T. ; Pinilla, P. ; Takami, M. ; Tamura, Motohide ; Tazzari, M. ; Wisniewski, J. P. / ALMA survey of Class II protoplanetary disks in Corona Australis : a young region with low disk masses. In: Astronomy & Astrophysics. 2019.

### Bibtex

@article{8f77154f45ec46afbbf73a60d1c00eae,
title = "ALMA survey of Class II protoplanetary disks in Corona Australis: a young region with low disk masses",
abstract = " In recent years, the disk populations in a number of young star-forming regions have been surveyed with ALMA. Understanding the disk properties and their correlation with those of the central star is critical to understand planet formation. In particular, a decrease of the average measured disk dust mass with the age of the region has been observed. We conducted high-sensitivity continuum ALMA observations of 43 Class II young stellar objects in CrA at 1.3 mm (230 GHz). The typical spatial resolution is 0.3{"}. The continuum fluxes are used to estimate the dust masses of the disks, and a survival analysis is performed to estimate the average dust mass. We also obtained new VLT/X-Shooter spectra for 12 of the objects in our sample. 24 disks are detected, and stringent limits have been put on the average dust mass of the non-detections. Accounting for the upper limits, the average disk mass in CrA is $6\pm3\,\rm M_\oplus$, significantly lower than that of disks in other young (1-3 Myr) star forming regions (e.g. Lupus) and appears consistent with the 5-10 Myr old Upper Sco. The position of the stars in our sample on the HR diagram, however, seems to confirm that that CrA has age similar to Lupus. Neither external photoevaporation nor a lower than usual stellar mass distribution can explain the low disk masses. On the other hand, a low-mass disk population could be explained if the disks are small, which could happen if the parent cloud has a low temperature or intrinsic angular momentum, or if the the angular momentum of the cloud is removed by some physical mechanism such as magnetic braking. In order to fully explain and understand the dust mass distribution of protoplanetary disks and their evolution, it may also be necessary to take into consideration the initial conditions of star and disk formation process, which may vary from region to region, and affect planet formation. ",
keywords = "astro-ph.EP, astro-ph.SR",
author = "P. Cazzoletti and Manara, {C. F.} and Liu, {H. B.} and Dishoeck, {E. F. van} and S. Facchini and Alcal{\`a}, {J. M.} and M. Ansdell and L. Testi and Williams, {J. P.} and C. Carrasco-Gonz{\'a}lez and R. Dong and J. Forbrich and M. Fukagawa and R. Galv{\'a}n-Madrid and N. Hirano and M. Hogerheijde and Y. Hasegawa and T. Muto and P. Pinilla and M. Takami and Motohide Tamura and M. Tazzari and Wisniewski, {J. P.}",
note = "20 pages, 8 Figures, accepted for publication on A&A. The abstract has been shortened in order to fit arXiv requirements",
year = "2019",
month = apr,
day = "3",
language = "English",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",

}

### RIS

TY - JOUR

T1 - ALMA survey of Class II protoplanetary disks in Corona Australis

T2 - a young region with low disk masses

AU - Cazzoletti, P.

AU - Manara, C. F.

AU - Liu, H. B.

AU - Dishoeck, E. F. van

AU - Facchini, S.

AU - Alcalà, J. M.

AU - Ansdell, M.

AU - Testi, L.

AU - Williams, J. P.

AU - Carrasco-González, C.

AU - Dong, R.

AU - Forbrich, J.

AU - Fukagawa, M.

AU - Galván-Madrid, R.

AU - Hirano, N.

AU - Hogerheijde, M.

AU - Hasegawa, Y.

AU - Muto, T.

AU - Pinilla, P.

AU - Takami, M.

AU - Tamura, Motohide

AU - Tazzari, M.

AU - Wisniewski, J. P.

N1 - 20 pages, 8 Figures, accepted for publication on A&A. The abstract has been shortened in order to fit arXiv requirements

PY - 2019/4/3

Y1 - 2019/4/3

N2 - In recent years, the disk populations in a number of young star-forming regions have been surveyed with ALMA. Understanding the disk properties and their correlation with those of the central star is critical to understand planet formation. In particular, a decrease of the average measured disk dust mass with the age of the region has been observed. We conducted high-sensitivity continuum ALMA observations of 43 Class II young stellar objects in CrA at 1.3 mm (230 GHz). The typical spatial resolution is 0.3". The continuum fluxes are used to estimate the dust masses of the disks, and a survival analysis is performed to estimate the average dust mass. We also obtained new VLT/X-Shooter spectra for 12 of the objects in our sample. 24 disks are detected, and stringent limits have been put on the average dust mass of the non-detections. Accounting for the upper limits, the average disk mass in CrA is $6\pm3\,\rm M_\oplus$, significantly lower than that of disks in other young (1-3 Myr) star forming regions (e.g. Lupus) and appears consistent with the 5-10 Myr old Upper Sco. The position of the stars in our sample on the HR diagram, however, seems to confirm that that CrA has age similar to Lupus. Neither external photoevaporation nor a lower than usual stellar mass distribution can explain the low disk masses. On the other hand, a low-mass disk population could be explained if the disks are small, which could happen if the parent cloud has a low temperature or intrinsic angular momentum, or if the the angular momentum of the cloud is removed by some physical mechanism such as magnetic braking. In order to fully explain and understand the dust mass distribution of protoplanetary disks and their evolution, it may also be necessary to take into consideration the initial conditions of star and disk formation process, which may vary from region to region, and affect planet formation.

AB - In recent years, the disk populations in a number of young star-forming regions have been surveyed with ALMA. Understanding the disk properties and their correlation with those of the central star is critical to understand planet formation. In particular, a decrease of the average measured disk dust mass with the age of the region has been observed. We conducted high-sensitivity continuum ALMA observations of 43 Class II young stellar objects in CrA at 1.3 mm (230 GHz). The typical spatial resolution is 0.3". The continuum fluxes are used to estimate the dust masses of the disks, and a survival analysis is performed to estimate the average dust mass. We also obtained new VLT/X-Shooter spectra for 12 of the objects in our sample. 24 disks are detected, and stringent limits have been put on the average dust mass of the non-detections. Accounting for the upper limits, the average disk mass in CrA is $6\pm3\,\rm M_\oplus$, significantly lower than that of disks in other young (1-3 Myr) star forming regions (e.g. Lupus) and appears consistent with the 5-10 Myr old Upper Sco. The position of the stars in our sample on the HR diagram, however, seems to confirm that that CrA has age similar to Lupus. Neither external photoevaporation nor a lower than usual stellar mass distribution can explain the low disk masses. On the other hand, a low-mass disk population could be explained if the disks are small, which could happen if the parent cloud has a low temperature or intrinsic angular momentum, or if the the angular momentum of the cloud is removed by some physical mechanism such as magnetic braking. In order to fully explain and understand the dust mass distribution of protoplanetary disks and their evolution, it may also be necessary to take into consideration the initial conditions of star and disk formation process, which may vary from region to region, and affect planet formation.

KW - astro-ph.EP

KW - astro-ph.SR

M3 - Article

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

ER -