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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We report the serendipitous discovery of a giant mid-infrared (MIR) outburstfrom a previously unknown source near a star-forming region in theconstellation Monoceros. The source gradually brightened by a factor of 5 from2014 to 2016 before an abrupt rise by a factor of more than 100 in 2017. Atotal amplitude increase of >500 at 4.5 microns has since faded by a factor ofabout 10. Prior to the outburst, it was only detected at wavelengths longerthan 1.8 microns in UKIDSS, Spitzer, and Herschel with a spectral energydistribution of a Class I Young Stellar Object (YSO). It has not been detectedin recent optical surveys, suggesting that it is deeply embedded. With aminimum distance of 3.5 kpc, the source has a bolometric luminosity of at least9 $L_\odot$ in the quiescent state and 400 $L_\odot$ at the peak of theeruption. The maximum accretion rate is estimated to be at least a few$10^{-5}$ $M_\odot$ year$^{-1}$. It shares several common properties withanother eruptive event, WISE~J142238.82-611553.7: exceptionally largeamplitude, featureless near-infrared spectrum with the exception of H_2 lines,intermediate eruption duration, an embedded Class I YSO, and a low radiativetemperature (<600-700 K) in outburst. We interpret that the radiation from theinner accretion disk and young star is obscured and reprocessed by either aninflated outer disk or thick dusty outflow on scales > 6.5 AU during theoutburst.

A Gigantic Mid-Infrared Outburst in an Embedded Class-I Young Stellar Object J064722.95+031644.6