%0 Generic %1 joergens2014coolest %A Joergens, V. %A Bonnefoy, M. %A Liu, Y. %A Bayo, A. %A Wolf, S. %D 2014 %K 2014 a:Joergens free-floating planets %T The coolest 'stars' are free-floating planets %U http://arxiv.org/abs/1407.7864 %X We show that the coolest known object that is probably formed in a star-like mode is a free-floating planet. We discovered recently that the free-floating planetary mass object OTS,44 (M9.5, ~12 Jupiter masses, age ~2 Myr) has significant accretion and a substantial disk. This demonstrates that the processes that characterize the canonical star-like mode of formation apply to isolated objects down to a few Jupiter masses. We detected in VLT/SINFONI spectra that OTS44 has strong, broad, and variable Paschen beta emission. This is the first evidence for active accretion of a free-floating planet. The object allows us to study accretion and disk physics at the extreme and can be seen as free-floating analog of accreting planets that orbit stars. Our analysis of OTS44 shows that the mass-accretion rate decreases continuously from stars of several solar masses down to free-floating planets. We determined, furthermore, the disk mass (10 Earth masses) and further disk properties of OTS44 through modeling its SED including Herschel far-IR data. We find that objects between 14 and 0.01 solar masses have the same ratio of the disk-to-central-mass of about 1%. Our results suggest that OTS44 is formed like a star and that the increasing number of young free-floating planets and ultra-cool T and Y field dwarfs are the low-mass extension of the stellar population.

@misc{joergens2014coolest, abstract = {We show that the coolest known object that is probably formed in a star-like mode is a free-floating planet. We discovered recently that the free-floating planetary mass object OTS,44 (M9.5, ~12 Jupiter masses, age ~2 Myr) has significant accretion and a substantial disk. This demonstrates that the processes that characterize the canonical star-like mode of formation apply to isolated objects down to a few Jupiter masses. We detected in VLT/SINFONI spectra that OTS44 has strong, broad, and variable Paschen beta emission. This is the first evidence for active accretion of a free-floating planet. The object allows us to study accretion and disk physics at the extreme and can be seen as free-floating analog of accreting planets that orbit stars. Our analysis of OTS44 shows that the mass-accretion rate decreases continuously from stars of several solar masses down to free-floating planets. We determined, furthermore, the disk mass (10 Earth masses) and further disk properties of OTS44 through modeling its SED including Herschel far-IR data. We find that objects between 14 and 0.01 solar masses have the same ratio of the disk-to-central-mass of about 1%. Our results suggest that OTS44 is formed like a star and that the increasing number of young free-floating planets and ultra-cool T and Y field dwarfs are the low-mass extension of the stellar population.}, added-at = {2014-07-31T22:38:56.000+0200}, author = {Joergens, V. and Bonnefoy, M. and Liu, Y. and Bayo, A. and Wolf, S.}, biburl = {https://www.bibsonomy.org/bibtex/2e1bc6f25ea8d4e34e33beba809604bbb/danielcarrera}, description = {[1407.7864] The coolest 'stars' are free-floating planets}, interhash = {d8959fe0de662548b11defcb919d7884}, intrahash = {e1bc6f25ea8d4e34e33beba809604bbb}, keywords = {2014 a:Joergens free-floating planets}, note = {cite arxiv:1407.7864Comment: Proceeding of 18th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, held in Flagstaff (AZ) on June 9-13, 2014, ed. by G. van Belle & H. Harris}, timestamp = {2014-07-31T22:38:56.000+0200}, title = {The coolest 'stars' are free-floating planets}, url = {http://arxiv.org/abs/1407.7864}, year = 2014 }