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Illustration of LTT 9779 b, the only known ultra-hot Neptune. This planet orbits so close to its star that its atmosphere is scorching hot, glowing from its own heat while also reflecting starlight. Because it is tidally locked - always showing the same side to its star - one half is permanently in daylight while the other remains in darkness. New JWST observations with NIRISS reveal a dynamic atmosphere: powerful winds sweep around the planet, shaping mineral clouds as they condense into a bright, white arc on the slightly cooler western side of the dayside. As these clouds move eastward, they evaporate under the intense heat, leaving the eastern dayside with clear skies.

Science

Today's forecast: partially cloudy skies on an "ultra-hot Neptune"

25 February 2025

Press release

Artist’s rendering of the exoplanet WASP-121b. It shows only a portion of the exoplanet, showcasing instead the three layers of its atmosphere with more detail.

Science

First 3D observations of an exoplanet’s atmosphere reveal a unique climate

18 February 2025

Press release

The study found that the planet’s atmosphere contains a high concentration of heavier molecules, including a significant amount of water vapor.

Science

Astronomers probe a “steam world”

4 October 2024

Press release

A star’s temperature is far from uniform; it varies both across the star’s surface and over time. Now an innovative technique developed by UdeM’s Étienne Artigau and his team makes it possible to track these changes with unprecedented precision.

Science

Taking a star’s temperature

19 September 2024

Press release

Temperate exoplanet LHS 1140 b may be a world completely covered in ice (left) similar to Jupiter’s moon Europa or may be an ice world with a liquid substellar ocean and a cloudy atmosphere (centre). LHS 1140 b is 1.7 times the size of our planet Earth (right) and is the most promising habitable zone exoplanet yet found in the search for liquid water beyond the Solar System.

Science

Found with Webb: a potentially habitable world

8 July 2024

Press release

The ELT dome under construction in Chile

Science

UdeM astronomers are helping to build the world’s largest telescope

25 June 2024

Article

The Landolt mission comprises a crucial step in the quest for precision in astronomy.

Science

Landolt space mission: more precise measurements of star brightness

10 June 2024

Press release

Most reports of animal behaviour during an eclipse are anecdotal, but it is clear that some animals do react unusually during solar events.

Science

How do animals react to a solar eclipse?

3 April 2024

Article

This artist's concept shows a "brown dwarf," a space object more massive than a planet but smaller than a star. Brown dwarfs usually have binary companions, but as they age some of these binary systems gravitationally fall apart, and each brown dwarf goes its separate way, according to a study led by Université de Montréal astronomer Clémence Fontanive.

Science

UdeM astronomer finds that "brown dwarfs" grow old alone

21 March 2024

Press release

Artist's concept of GJ 9827d. With only about twice Earth's diameter, the planet orbits the red dwarf star GJ 9827; two inner planets in the system are on the left.

Science

Water vapour discovered in a small exoplanet’s atmosphere

25 January 2024

Press release

An artistic representation of the “hot Saturn” exoplanet, HAT-P-18 b.

Science

Unlocking the secrets of a "hot Saturn" and its spotted star

9 January 2024

Press release

Science

Astronomers now know how far the Earth is from 200 galaxies

31 October 2023

Press release

Community

AstroMIL is coming back to UdeM on Oct. 14

6 October 2023

Article

This artistic representation of the TRAPPIST-1 red dwarf star showcases its very active nature. The star appears to have many stellar spots (colder regions of its surface, similar to sunspots) and flares. The exoplanet TRAPPIST-1 b, the closest planet to the system’s central star, can be seen in the foreground with no apparent atmosphere. The exoplanet TRAPPIST-1 g, one of the planets in the system’s habitable zone, can be seen in the background to the right of the star. The TRAPPIST-1 system contains seven Earth-sized exoplanets.

Science

New insights into the atmosphere and star of an exoplanet

25 September 2023

Press release

The ultra-hot giant exoplanet WASP-76 b, depicted here, is an extremely hot world orbiting very close to its giant star.

Science

A scorching-hot exoplanet scrutinized by UdeM astronomers

14 June 2023

Press release

There’s an intriguing exoplanet out there – 400 light-years out there – that is so tantalising that astronomers have been studying it since its discovery in 2009. One orbit for WASP-18 b around its star that is slightly larger than our Sun takes just 23 hours.

Science

Canadian NIRISS instrument on Webb Maps an Ultra-Hot Jupiter’s Atmosphere

31 May 2023

Press release

René Doyon

Community

René Doyon receives prestigious NASA Medal

26 May 2023

Press release

LP 791-18 d, illustrated here, is an Earth-size world about 86 light-years away. The gravitational tug from a more massive planet in the system, shown as a blue dot in the background, may result in internal heating and volcanic eruptions on this exoplanet – as much as Jupiter’s moon Io, the most geologically active body in the Solar System.

Science

Found: a likely volcano-covered terrestrial world outside the Solar System

17 May 2023

Press release

Science

In one year, southern Quebec will witness a total eclipse of the Sun

5 April 2023

Press release

From left to right: Sophie-Andrée Blondin, René Doyon and Charles Tisseyre.

Community

René Doyon: A scientific star with both feet firmly planted on the ground

29 January 2023

Article

Artistic representation of the planetary system of the star Kepler-138. We see Kepler-138 d in the foreground, and closer to the star, Kepler-138 c. These two planets are probably composed mainly of water. The small planet Kepler-138 b is seen transiting in front of the star. A fourth planet, Kepler-138 e, is further away and not visible in the image.

Science

Université de Montréal astronomers find that two exoplanets may be mostly water

15 December 2022

Press release

From left to right: Marie-Eve Naud, Frédérique Baron and Nathalie Ouellette.

Community

Three astrophysicists promoting science through iREx

21 November 2022

Article

Science

iREx making major contribution to astronomy

21 November 2022

Article

Illustration showing what the exoplanet WASP-39 b could look like, based on current understanding of the planet.

Science

Signs of CO2 in a planet beyond our solar system

25 August 2022

Press release

Artistic rendition of the exoplanet TOI-1452 b, a small planet that may be entirely covered in a deep ocean.

Science

An extrasolar world covered in water?

24 August 2022

Press release

Science

James Webb Space Telescope: beginning to see the light

6 April 2022

Press release

Science

Three videos ahead of the James Webb Space Telescope launch

20 December 2021

Article

Science

The James Webb telescope: part alien life detector, part time machine

9 December 2021

Article

Nathalie Ouellette, coordinator of the Exoplanet Research Institute at the Université de Montréal, and Olivia Lim, a doctoral student at the Université de Montréal.

Science

Women helped make the James Webb Space Telescope a reality

3 December 2021

Article

Artist's rendition of the James Webb Space Telescope. (Source: NASA)

Science

Three UdeM astophysicists to help inaugurate the James Webb Space Telescope

28 October 2021

Press release

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