Embry-Riddle Aeronautical University Issue 12 | Volume 149 | April 24th
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TESS: Continuing the Search for Extrasolar Planets sion. Ground-based telescopes used this same method on their observations and used it to help validate Kepler’s exoplanet candidates. With K2, the Kepler mission extension, coming to a close, there came a desire to develop a spacecraft that will continue Kepler’s slew of exoplanet discoveries. Kepler has cataloged over 2000 confirmed exoplanets and added an additional 300 exoplanets over its multi-year extension. This major success drove a team at MIT to develop TESS to continue Kepler’s work, this time taking it to a whole new level. Natalia Guerrero, Deputy TESS Object of Interest Manager at MIT, said that the ball really began rolling on TESS in 2009 when Kepler launched, and a large number of discoveries kept the funds coming in for the project. TESS features four specially designed cameras that will cover an area over 350 times the size of the Kepler search field. A proponent for women in STEM, Guerrero took a moment to voice encouragement for young girls hoping to pursue careers in these fields: “Don’t be afraid to accept any opportunities that may come your way that are related to your interests! If you are unsure, just try it, and see what you think.” Guerrero began working on TESS in 2016 after graduation from MIT. She hopes to become a research scientist for the MIT team, helping probe through the large volume of data that TESS will send down when it passes close to Earth. TESS is situated in a special elliptical orbit that is synchronized with the orbit of the Moon. TESS will orbit Earth twice for every single orbit the Moon completes. This orbit will take 60 days to reach, as the spacecraft needs to get into phase with the Moon’s orbit and line up for a gravitational assist that will fling it into the transfer orbit needed to reach the primary mission orbit. This is the first time that this type of orbit has been used for a spacecraft. Kepler was placed in a heliocentric orbit, enabling it to focus on a small patch of sky. This “pencil beam” survey was enough for Kepler to find out whether exoplanets were a rarity or something common. TESS, on the other hand, will be surveying the entire sky. Its unique orbit enables it to monitor a sector of sky continuously for up to 27 days. Every two weeks the spacecraft will make its closest pass over Earth. That is when it sends data down through NASA’s Deep Space Network and relayed to the MIT team through Orbital’s Mission Operations Center. The data largely consists of transit graphs. Teams from NASA, MIT, and the Smithsonian will help comb through the large volume of information. Guerrero also mentioned having the TESS data made public so amateur planet hunters can help sift through the incoming data. TESS will be producing much more transit information than Kepler, so the more eyes to help look for planet candidates, the faster discoveries can be made. TESS is slated for a two-year primary mission, and with 27 days per sector of the sky and some 26 sectors to cover, that’s only about one month per sector.
Keenan Thungtrakul Senior Reporter On the beautiful Wednesday evening of April 18, SpaceX’s final Falcon 9 Block 4 roared to life at Launch Complex 40. The rocket was carrying none other than NASA’s Transiting Exoplanet Survey Satellite, or TESS. TESS is a joint venture between NASA, Orbital ATK, and the Massachusetts Institute of Technology, among others. TESS is part of a series of space telescopes designed to search for planets beyond our solar system. This series began with the Hubble Space Telescope and continued with the infrared Spitzer Space Telescope and the Kepler Space Telescope. TESS is the next version up from Kepler and will help lead the way for NASA’s James Webb Space Telescope (JWST) and other future planet-hunting missions. The overarching goal of these series of missions is to answer questions that have and are continuing to drive humanity’s quest for the stars, including the iconic question, “are we alone?” Humans have always wanted to know their place in the universe. They developed technology that allowed them to observe the cosmos and wonder what could be out there. Fast forward several centuries, humans have now developed vehicles that took them to the Moon and Mars. Currently, humanity is seeking to become a multiplanetary, interstellar species. It is like the ultimate Manifest Destiny, a generations-long quest to explore and colonize space, the “final frontier.” The Earth is only a temporary home. Although the planet will be around for another few million years, a time will come when the Sun will run out of fuel and consume Earth as it dies. Finding a second Earth to call home is essential if humanity is to have any hope and motivation for expanding into and beyond our solar system. According to Kepler Program Scientist Martin Still, it is this drive that inspired the Kepler mission. The Kepler spacecraft has shown that exoplanets are not rare, but common. TESS will take what Kepler has discovered and reel it back closer to home. The search for extrasolar planets (also called exoplanets) began with observations by Hubble and ground-based telescopes of occasional wobbles of distant stars. It is theorized that these wobbles are caused by the gravity of a second invisible body tugging on the star. This theory is what led to the discovery of a class of exoplanets known as “hot Jupiters.” Think of a gas giant the size of Jupiter or larger, orbiting its host star within the orbit radius of Mercury. These planets are nowhere close to being able to support life. Planets that are about the size of Earth are practically impossible to detect via this method, so a new method of detecting exoplanets was proposed: the transit method. The transit method takes light measurements from a star over time and creates a spectral graph with occasional dips. These dips come from some other body blocking the light from the star. That body could be an exoplanet or another star. The transit method is currently being employed by Kepler and is the method that TESS will be using during its mis-
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Collin Anderson, Alex Lee, Keenan Thungtrakul/The Avion Newspaper
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