#exoplanet is an active hashtag on Bluesky. In the last 30 days, 49 people shared 208 posts with it — around 7 a day. Activity is down 54% versus the previous week, peaking on Jul 30 with 32 posts.

Posts with #exoplanet

Dr Ryan MacDonald

@distantworlds.space

over 1 year ago

𝗡𝗼, 𝗮 𝗯𝗶𝗼𝘀𝗶𝗴𝗻𝗮𝘁𝘂𝗿𝗲 𝘄𝗮𝘀 𝗻𝗼𝘁 𝗷𝘂𝘀𝘁 𝗱𝗲𝘁𝗲𝗰𝘁𝗲𝗱 𝗶𝗻 𝗞𝟮-𝟭𝟴𝗯'𝘀 𝗮𝘁𝗺𝗼𝘀𝗽𝗵𝗲𝗿𝗲. K2-18b is back in the news, now with a bold claim that biosignature molecules (DMS and/or DMDS) have been 'detected at 3σ'. Most exoplanet astronomers are extremely sceptical about these claims, let's see why (1/n). 🔭🧪🪐 #exoplanet

Artist's impression of the exoplanet K2-18b.
Credit: A. Smith, University of Cambridge.

37 364 1120

Emily Hunt

@emily.space

almost 3 years ago

🪐 We have a new feed: Exoplanets! 🪐 Anyone registered to post to the Astronomy feed can post there with a 🪐, #exoplanet, or #exoplanets. Posting there automatically cross-posts back to the Astronomy feed, too!

10 66 421

Astrobiology

@astrobiology.bsky.social

over 2 years ago

This poster visualizes over 800 of known exoplanets believed to be rocky or terrestrial, arranged by the amount of heat they receive, comparing their relative sizes and providing a window to how they might look like. see: Halcyon Maps www.halcyonmaps.com/terre…. #astrobiology #exoplanet

4 79 341

Dr. Jessie Christiansen

@aussiastronomer.bsky.social

over 2 years ago

Actually check out THIS fabulous set of wooden coasters I got. #exoplanet

A set of wooden coasters with circles inlaid on circles resembling transiting planets.

8 26 249

Shanika Galaudage

@astronerdika.bsky.social

over 1 year ago

So I know folks have heard the news about an exoplanet that might be “teeming with life”? 🌱 I created a series of infographics that aims to cover the key points of the research findings + some of the area where scientists are sceptical! 🧐 Meet K2-18b! 👋 #astronomy #exoplanet #scicomm

Infographic about the exoplanet K2-18b and its discovery with Kepler

15 45 161

Dr. Jessie Christiansen

@aussiastronomer.bsky.social

over 1 year ago

Dueling press releases today for two exciting nearby #exoplanet system updates! 🪐🔭 GJ 3998: a super-Earth in the habitable zone added to this system with two previously known planets! www.iac.es/en/outreach/... And Barnard's star: three new sub-Earth-sized planets added to this nearby M dwarf!

phys.org

Four tiny planets are orbiting one of our nearest stars

Astronomers have revealed new evidence that not just one, but four tiny planets are circling around Barnard's Star, the second-nearest star system to Earth.

3 32 127

Ailantd Sikowsky

@ailantd.com

over 2 years ago

Very rough picture of another exoplanet explorer before ending the day. It is not clear without opening it whether this one is still operational or if there is just a lonely desiccated body inside. Would you take a look inside? #scifi #scifiart #exoplanet #explorer

3 24 115

💀Adina Feinstein PhD 💀

@afeinstein20.bsky.social

over 1 year ago

as suggested by @wardhoward.bsky.social - an #exoplanet alignment chart 🪐🔭🧪

a dungeons and dragons alignment chart for different types of exoplanets. Here are the assigned alignments:
1. Lawful good - hot Jupiters
2. Neutral good - inflated Saturns
3. Chaotic good - ultra hot Jupiters
4. Lawful neutral - rocky planets
5. True neutral - brown dwarfs
6. Chaotic neutral - super-Earths
7. Lawful evil - sub-Neptunes
8. Neutral evil - young planets
9. Chaotic evil - pulsar planets

6 18 113

Dr Ryan MacDonald

@distantworlds.space

over 1 year ago

The K2-18b saga deepens with a great new paper out today by @luiswel.bsky.social (arxiv.org/abs/2504.21788). Turns out hydrocarbons can explain K2-18b's new JWST MIRI spectrum *without* the need to invoke DMS or DMDS as biosignatures. Read on to find out more! 🧵 #Exoplanet 🔭🪐

The Challenges of Detecting Gases in Exoplanet Atmospheres by Luis Welbanks et al.

Abstract: Claims of detections of gases in exoplanet atmospheres often rely on comparisons between models including and excluding specific chemical species. However, the space of molecular combinations available for model construction is vast and highly degenerate. Only a limited subset of these combinations is typically explored for any given detection. As a result, apparent detections of trace gases risk being artifacts of incomplete modeling rather than robust identification of atmospheric constituents, especially in the low signal-to-noise regime. We illustrate these challenges using the sub-Neptune K2-18~b, where recent claims of a potential biosignature detection vanish when the considered model space is expanded. We show that numerous alternative models without potential biosignature gases provide equivalent or better fits to the observations. We demonstrate that the significance of a claimed detection relies on the choice of models being compared, and that model preference does not necessarily imply the presence of any specific gas.

https://arxiv.org/abs/2504.21788

1 25 97

Jingyuan Zhao (赵经远)

@astrozhao.bsky.social

9 days ago

In May 2022, I discovered a planet candidate via Planet Hunters TESS on @zooniverse.bsky.social . Today it is officially confirmed as TOI-5628 Ab, and our paper published in ApJL. I am grateful to Dr. Tianjun Gan for inviting me as a co-author. iopscience.iop.org/articl…. 1/9 🔭 🧪 #exoplanet

Artist's impression of the TOI‑5628 system. In the upper left is the exoplanet TOI‑5628 Ab, in the lower right is the red dwarf TOI‑5628 A, and in the upper right is the white dwarf TOI‑5628 B.

(This image was originally an artist's impression of another exoplanet, NGTS‑1b, image credit: University of Warwick / Mark Garlick. After I had Grok add the white dwarf in the upper right, it fits the TOI‑5628 system very well.)

2 9 45

Nereide

@drnereide.bsky.social

over 1 year ago

🧵 1/ Mind-blowing! An international team of astronomers has made an unexpected discovery: supersonic winds are raging on the exoplanet WASP-127b, a gas giant larger than Jupiter but with a much lower mass, located over 500 ly from Earth. Source➡️ eso.org/public/unite... 🔭 🧪 #exoplanet #planetsci

4 21 94

Chara

@astrochara.bsky.social

10 months ago

A study on drawing a hot Jupiter's nightside. The dayside is overexposed. The nightside is pinkish from the combination of blackbody radiation and absorption from Na/K/H2O, similar to brown dwarfs. #art #astronomy #space #planet #exoplanet #HotJupiter