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The Cocoon from a Massive Star’s Death: VLA Radio Polarization Study of Possible Historical Supernova Remnant G7.7–3.7

7 August 2026 at 17:00
Tian-Xian Luo et al 2026 ApJ 1003 152
Polarization measurements show evidence of shock compression and possible interaction between a supernova remnant and previously formed circumstellar shells from the progenitor’s mass loss.

The post The Cocoon from a Massive Star’s Death: VLA Radio Polarization Study of Possible Historical Supernova Remnant G7.7–3.7 appeared first on AAS Nova.

A Massive Hot-Jupiter Companion that Disfavors Giant Planet Formation beyond the Water-Ice Line

6 August 2026 at 17:00
Eritas Yang et al 2026 ApJL 1004 L29
The presence of a 34-solar-mass brown dwarf companion to an ultra-hot Jupiter suggests that the hot Jupiter must have formed within 1.5 au of its host star to remain dynamically stable.

The post A Massive Hot-Jupiter Companion that Disfavors Giant Planet Formation beyond the Water-Ice Line appeared first on AAS Nova.

The Large Smooth Patch on Comet 9P/Tempel 1: Remnant of a Recent Past Event

5 August 2026 at 17:00
J. L. Rizos et al 2026 Planet. Sci. J. 7 123
Using gravitational flow simulations, researchers link smooth areas on the face of a comet to a single event 600–1,200 years ago, possibly connected to multiple close encounters with Jupiter.

The post The Large Smooth Patch on Comet 9P/Tempel 1: Remnant of a Recent Past Event appeared first on AAS Nova.

Isolating Sgr A East: The First Uncontaminated X-Ray Maps of a Galactic Center Supernova Remnant

4 August 2026 at 17:00
Mayura Balakrishnan et al 2026 ApJ 1003 128
Sgr A East strongly overlaps with plasma associated with the Milky Way’s central supermassive black hole, but new efforts to disentangle this emission have successfully isolated the remnant’s emission.

The post Isolating Sgr A East: The First Uncontaminated X-Ray Maps of a Galactic Center Supernova Remnant appeared first on AAS Nova.

TOI-2155 b: A Massive Brown Dwarf or a Very Low-Mass Star?

3 August 2026 at 17:00
Md Redyan Ahmed et al 2026 AJ 172 21
Slightly smaller than Jupiter but roughly 80 times as massive, TOI-2155b can provide a valuable test for models of stellar-mass objects near the hydrogen-burning mass limit.

The post TOI-2155 b: A Massive Brown Dwarf or a Very Low-Mass Star? appeared first on AAS Nova.

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