Elisabeth Newton | Harvard Horizons Symposium

TL;DR

Red dwarf stars, which make up 70% of all stars in our Milky Way galaxy, hold the best prospects for finding habitable rocky planets with the potential for life.

Transcript

when I look up at the night sky from Cambridge I can only see a few dozen stars from the dark mountaintops where I use telescopes I can see thousands yet even this is a small fraction of all that's out there our Milky Way galaxy contains hundreds of billions of stars and 70% of all of these stars are a type of star we call red dwarfs but even from ... Read More

Key Insights

• 🤩 Red dwarf stars make up the majority of stars in our galaxy, and studying them can provide insights into the properties of their planets.
• 🤩 Theoretical models of red dwarf stars still have uncertainties, which hamper our understanding of their fundamental properties.
• 🤩 Spectroscopy is a valuable technique for studying red dwarf stars, as it provides clues about their composition and physical characteristics.
• 🤩 Relationships between specific spectral features and the star's properties were discovered, allowing for more accurate measurements of red dwarf stars' properties.
• 🪐 Applying these calibrations to known red dwarf stars with planets revealed changes in the planet's properties, such as size.
• 🤩 Red dwarf stars that cannot be seen hold the greatest potential for finding and studying habitable rocky planets.
• 🤩 Next-generation telescopes will enable the study of the atmospheres of planets orbiting red dwarf stars, potentially revealing signs of life.

Questions & Answers

Q: What makes red dwarf stars difficult to observe without the aid of a telescope?

Red dwarf stars are too faint to be seen with the naked eye, even the closest and brightest ones, due to their smaller size and lower light emission.

Q: Why are red dwarf stars the best prospects for finding habitable rocky planets?

Red dwarf stars are more likely to have planets similar in size to Earth, and their smaller size makes it easier to study the planets' properties and atmospheres.

Q: What are the challenges in studying planets around red dwarf stars?

The uncertainties in theoretical models of red dwarf stars make it difficult to accurately measure the properties of the planets, as they are measured relative to the star's properties.

Q: How did the researcher study red dwarf stars and their properties?

The researcher used a spectroscopy technique, measuring the spectra of 600 nearby red dwarf stars to obtain clues about their properties, such as temperature, diameter, and chemical composition.

Summary & Key Takeaways

• Our Milky Way galaxy contains hundreds of billions of stars, with 70% of them being red dwarfs.

• Red dwarfs are smaller and fainter than the Sun, emitting most of their light in the infrared spectrum.

• The properties of red dwarf stars, such as size, age, and composition, are still not well understood, making it challenging to study the planets orbiting them.