Natalie Batalha on Exoplanet Discovery, Kepler, and Future Missions

The Dawn of Exoplanet Discovery

• 💡 Natalie Batalha recounts her front-row seat to exoplanet discovery, starting as a stellar astrophysicist when no exoplanets were known.
• 🚀 She was present for the announcement of the first exoplanet orbiting a sun-like star in the early 1990s, marking a pivotal moment in astronomy.

Kepler Mission and Transit Photometry

• 🛰️ Batalha was instrumental in the Kepler mission, a NASA satellite that revolutionized exoplanet detection using transit photometry.
• 🧐 She details overcoming the challenge of star spots by using digital filters and observing a larger number of stars to ensure accurate transit detection.
• 🛠️ Kepler's goal was to find Earth-sized planets in habitable zones and quantify their frequency, ultimately discovering thousands of planet candidates.

Engineering Triumphs and Mission Evolution

• ⚙️ After losing a reaction wheel, Kepler engineers ingeniously adapted the telescope's pointing strategy to continue data collection, leading to the K2 mission.
• 🔭 The Kepler mission, despite its relatively modest budget, discovered about half of all confirmed exoplanets to date.
• 🌌 TESS, a successor mission, surveys the entire sky for nearby transiting planets, crucial for follow-up observations with telescopes like JWST.

Unlocking Atmospheric Secrets with JWST

• ✨ The James Webb Space Telescope (JWST) has dramatically accelerated exoplanet atmosphere studies, observing hundreds of planets in just a few years.
• 🧪 Transmission spectroscopy with JWST allows scientists to detect chemical fingerprints in exoplanet atmospheres, revealing details like sulfur dioxide and the presence of photochemistry.
• 🌡️ JWST can also map planetary temperature distributions by observing thermal emission as planets eclipse and re-emerge from behind their stars.

The Search for Rocky Planets and Habitability

• 🪨 A major focus is determining if rocky planets orbiting M dwarf stars possess atmospheres, as M dwarfs are the most common stars in the galaxy.
• ❓ Early JWST observations suggest some of these planets may be