ELFT HÍRADÓ

[vidakris AT konkoly.hu]

Szemináriumi meghívó / Invitation to a seminar
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CSFK CSI SZEMINÁRIUM / KONKOLY OBSERVATORY SEMINAR

Date: Nov 28 (Thursday) 14:00


Csaba Kiss (Konkoly Observatory; Hungary): Prominent Mid-infrared Excess of 
the Dwarf Planet (136472) Makemake Discovered by JWST/MIRI Indicates Ongoing 
Activity

In this talk I am presenting our discovery of a very prominent mid-infrared 
(18–25 μm) excess associated with the trans-Neptunian dwarf planet (136472) 
Makemake. The excess, detected by the Mid-Infrared Instrument of the James 
Webb Space Telescope, along with previous measurements from the Spitzer and 
Herschel space telescopes, indicates the occurrence of temperatures of ∼150 
K, much higher than what solid surfaces at Makemake's heliocentric distance 
could reach by solar irradiation. We identify two potential explanations: a 
continuously visible, currently active region powered by subsurface upwelling 
and possibly cryovolcanic activity covering ≤1% of Makemake's surface or an 
as-yet-undetected ring containing very small carbonaceous dust grains, which 
have not been seen before in trans-Neptunian or Centaur rings. Both scenarios 
point to unprecedented phenomena among trans-Neptunian objects and could 
greatly impact our understanding of these distant worlds.

https://konkoly.hu/k-szeminariumok

The seminar will be held live in the Detre hall with audience, but also 
streamed online via Zoom. If you are unable to attend the presentation in 
person, you can join us via this link
https://us06web.zoom.us/j/82806911982?pwd=SVZpT0syQ1J6dHBvSkF4N2dXNEQ0dz09
or the meeting ID: 828 0691 1982 and passcode: 206265



Everyone is welcome!

Krisztián Vida, Ramon Brasser
organizers
https://konkoly.hu/k-szeminariumok