Confirmation of a ring structure in the disk around MP Mus (PDS 66) with ALMA Band 7 observations

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A90106%2F25%3A00646349" target="_blank" >RIV/67985815:90106/25:00646349 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1051/0004-6361/202554484" target="_blank" >https://doi.org/10.1051/0004-6361/202554484</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202554484" target="_blank" >10.1051/0004-6361/202554484</a>

Result language

angličtina

Original language name

Confirmation of a ring structure in the disk around MP Mus (PDS 66) with ALMA Band 7 observations

Original language description

Young stellar objects (YSOs) are surrounded by protoplanetary disks, which are the birthplace of young planets. Ring and gap structures are observed among evolved protoplanetary disks, often interpreted as a consequence of planet formation. Aims. The pre-Main Sequence (pre-MS) star MP Mus hosts one of the few known examples of protoplanetary disks within 100 pc. Previously, a disk ring structure, with a radius of 80-85 au, was detected in scattered light via near-infrared polarimetric imaging. This ring structure may be indicative of the disk clearing process. Although such ring structures were not seen in the ALMA Band 6 images, some features were detected at similar to 50 au. Methods. In this paper, we analyzed new ALMA Band 7 observations of MP Mus in order to investigate the details of its disk substructures. Results. By subtracting the continuum profile generated from Band 7 data, we discovered a ring structure in the Band 7 dust continuum image at similar to 50 au. We calculated the overall dust mass as 28.4 +/- 2.8 M circle plus at 0.89 mm and 26.3 +/- 2.6 M circle plus at 1.3 mm and the millimeter spectral index alpha 0.89-1.3 mm similar to 2.2 +/- 0.3 between 0.89 mm and 1.3 mm. Moreover, we display the spatial distribution of the spectral index (alpha mm), estimating values ranging from 1.3 at the inner disk to 4.0 at a large radius. Additionally, we observed an extended gas disk up to similar to 120 au, in contrast with a compact continuum millimeter extent of similar to 60 au. Conclusions. We conclude that there are strong indicators for an active radial drift process within the disk. However, we cannot discard the possibility of a dust evolution process and a grain growth process as responsible for the outer disk structures observed in the ALMA continuum imaging.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

—

Continuities

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Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Volume of the periodical

698

Issue of the periodical within the volume

June

Country of publishing house

FR - FRANCE

Number of pages

11

Pages from-to

A165

UT code for WoS article

001507317300007

EID of the result in the Scopus database

2-s2.0-105008174894