A New Closest Star? - Getting WISE to Brown Dwarfs

Value of the Information & Strength of the Argument

The talk provides a comprehensive overview of the search for the coldest brown dwarfs, with a strong emphasis on the scientific motivation and the technical aspects of the WISE mission. Cushing effectively argues for the importance of studying these objects, linking them to exoplanet atmospheres and the initial mass function. The argumentation is solid, based on observational data and theoretical models, and he acknowledges the complexities and uncertainties in interpreting the spectra. The presentation is well-structured and accessible to an audience with some background in astronomy.

The title is somewhat catchy but the talk is more about the WISE mission's discoveries of cold brown dwarfs than about a specific new closest star. It is broadly accurate.

8/10

Talk by a leading expert in brown dwarf spectroscopy, presenting results from the WISE mission. The content is scientifically rigorous, based on peer-reviewed research and mission data. Some limitations: the talk is from 2018, so some details may be outdated, and it is a seminar rather than a peer-reviewed publication.

Markers derived by PSI from the transcript: the creator did not define chapters.

• 02:00Introduction to the talk and the WISE brown dwarf science team.
• 05:00Explanation of brown dwarf basics: they do not fuse hydrogen and cool over time.
• 10:00Discussion of molecular-rich atmospheres and the chemistry of brown dwarfs.
• 15:00The discovery of Gliese 229B and the addition of L and T spectral types.
• 20:00Motivation for studying cold brown dwarfs: exoplanet atmospheres and mass function.
• 25:00Introduction to the WISE mission and its all-sky survey.
• 30:00How WISE finds cold brown dwarfs using W1-W2 color.
• 35:00Discovery of the first Y dwarf, WISE 1828+2650.
• 40:00Current census of Y dwarfs and their properties.
• 45:00Constraints on the low-mass field mass function and future prospects.

• WISE mission — The talk is based on data from the WISE mission, and the speaker is a member of the WISE science team.
• AllWISE data release — The speaker mentions the AllWISE data release, which includes the source catalog and apparent motion measurements.
• Gliese 229B discovery paper — The speaker discusses the discovery of Gliese 229B, the first confirmed brown dwarf.
• Kirkpatrick et al. 2012 (Y dwarfs) — The speaker references the discovery of Y dwarfs with WISE, likely referring to this paper.

• Cushing et al. 2011 (Y dwarf discovery) — The speaker is the lead author on the paper announcing the discovery of the first Y dwarf, which is consistent with the talk's content.