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 present the first trigonometric parallax and distance for a youngplanetary mass object. A likely TW Hya cluster member, 2MASSW J1207334-393254Ab(hereafter 2M1207Ab) is an M8 brown dwarf with a mid to late L type planetarymass companion. Recent observations of spectral variability have uncoveredclear signs of disk accretion and outflow, constraining the age of the systemto <10 Myr. Because of its late spectral type and the clearly youthful natureof the system, 2M1207b is very likely a planetary mass object. We have measuredthe first accurate distance and luminosity for a self-luminous planetary massobject. Our parallax measurements are accurate to <2 mas (1sigma) for 2M1207Ab.With 11 total epochs of data taken from January 2006 through April 2 007 (475images for 2M1207Ab), we determine a distance of 58.8+-7.0 pc (17.0{+2.3}{-1.8}mas, 1.28sigma) to 2M1207Ab and a calculated luminosity of 0.68-2.2x10^-5 Lsunfor 2M1207b. Hence 2M1207Ab is a clear member of the TW Hya cluster in terms ofits distance, proper motions, and youthful nature. However, as previously notedby Mohanty and co-workers, 2M1207b's luminosity appears low compared to itstemperature according to evolutionary models.

The First Direct Distance and Luminosity Determination for a Self-Luminous Giant Exoplanet: The Trigonometric Parallax to 2MASS1207334-393254Ab