English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present the first high spatial resolution near‐infrared direct and polarimetric observations of Parsamian 21, obtained with the Nasmyth Adaptive Optics System‐CONICA instrument at the Very Large Telescope (VLT). We complemented these measurements with archival infrared observations, such as  Hubble Space Telescope  ( HST )/Wide Field Planetary Camera 2 (WFPC2) imaging,  HST /Near Infrared Camera and Multi‐Object Spectrometer (NICMOS) polarimetry, photometry with the  Spitzer Space Telescope's  Infrared Array Camera (IRAC) and Multiband Imaging Photometer (MIPS), spectroscopy with  Spitzer's  Infrared Spectrograph (IRS), as well as  Infrared Space Observatory  ( ISO ) photometry. Our main conclusions are as follows: (1) we argue that Parsamian 21 is probably an FU Orionis‐type object (FUor); (2) Parsamian 21 is not associated with any rich cluster of young stars; (3) our measurements reveal a circumstellar envelope, a polar cavity and an edge‐on disc; the disc seems to be geometrically flat and extends from approximately 48 to 360 au from the star; (4) the spectral energy distribution (SED) can be reproduced with a simple model of a circumstellar disc and an envelope; (5) within the framework of an evolutionary sequence of FUors proposed by Green et al. and Quanz et al., Parsamian 21 can be classified as an intermediate‐aged object.

High‐resolution polarimetry of Parsamian 21: revealing the structure of an edge‐on FU Ori disc ★