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 results of a pilot program to conduct an Atacama LargeMillimeter/submillimeter Array (ALMA) Band 6 (211-275 GHz) spectral line studyof young stellar objects (YSO) that are undergoing rapid accretion episodes,i.e. FU Ori objects (FUors). Here, we report on molecular emission lineobservations of the FUor system, V883 Ori. In order to image the FUor objectwith full coverage from ~0.5 arcsec to the map size of ~30 arcsec, i.e. fromdisc to outflow scales, we combine the ALMA main array (the 12-m array) withthe Atacama Compact Array (7-m array) and the total power (TP) array. We detectHCN, HCO$^{+}$, CH$_{3}$OH, SO, DCN, and H$_{2}$CO emissions with most of theselines displaying complex kinematics. From PV diagrams, the detected moleculesHCN, HCO$^{+}$, CH$_{3}$OH, DCN, SO, and H$_{2}$CO probe a Keplerian rotatingdisc in a direction perpendicular to the large-scale outflow detectedpreviously with the $^{12}$CO and $^{13}$CO lines. Additionally, HCN andHCO$^{+}$ reveal kinematic signatures of infall motion. The north outflow isseen in HCO$^{+}$, H$_{2}$CO, and SO emissions. Interestingly, HCO$^{+}$emission reveals a pronounced inner depression or "hole" with a size comparableto the radial extension estimated for the CH$_{3}$OH and 230 GHz continuum. Theinner depression in the integrated HCO$^{+}$ intensity distribution of V883 Oriis most likely the result of optical depth effects, wherein the optically thicknature of the HCO$^{+}$ and continuum emission towards the innermost parts ofV883 Ori can result in a continuum subtraction artifact in the final HCO$^{+}$flux level.

A Chemical Map of the Outbursting V883 Ori system: Vertical and Radial Structures