A nearby transiting rocky exoplanet that is suitable for atmospheric investigation by Fausnaugh, Michael, Ricker, George R, Seager, Sara, Shporer, Abraham-Avi, Tenenbaum, Peter, Vanderspek, Roland K

“…Spectroscopy of transiting exoplanets can be used to investigate their atmospheric properties and habitability. Combining radial velocity (RV) and transit data provides additional information on exoplanet physical properties. …”
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Exploring the Atmospheric Dynamics of the Extreme Ultrahot Jupiter KELT-9b Using TESS Photometry by Wong, Ian, Shporer, Avi, Kitzmann, Daniel, Morris, Brett M, Heng, Kevin, Hoeijmakers, H Jens, Demory, Brice-Olivier, Ahlers, John P, Mansfield, Megan, Bean, Jacob L, Daylan, Tansu, Fetherolf, Tara, Rodriguez, Joseph E, Benneke, Björn, Ricker, George R, Latham, David W, Vanderspek, Roland, Seager, Sara, Winn, Joshua N, Jenkins, Jon M, Burke, Christopher J, Christiansen, Jessie L, Essack, Zahra, Rose, Mark E, Smith, Jeffrey C, Tenenbaum, Peter, Yahalomi, Daniel

“…The measured secondary eclipse depth and peak-to-peak atmospheric brightness modulation are and 566 16 ppm, respectively. …”
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Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization by Burt, Jennifer A, Burke, Chris, Dragomir, Diana, Dynes, Scott Bc, Ricker, George R, Seager, Sara, Vanderspeck, R.

“…Therefore, GJ 357 b represents one of the best terrestrial planets suitable for atmospheric characterization with the upcoming JWST and ground-based ELTs.…”
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TESS Hunt for Young and Maturing Exoplanets (THYME). IV. Three Small Planets Orbiting a 120 Myr Old Star in the Pisces–Eridanus Stream by Villeneuva, Steven, Levine, Alan M, Guerrero, Natalia M., Hesse, Katharine, Ricker, George R, Vanderspek, Roland K, Seager, Sara

“…Young exoplanets can offer insight into the evolution of planetary atmospheres, compositions, and architectures. We present the discovery of the young planetary system TOI 451 (TIC 257605131, Gaia DR2 4844691297067063424). …”
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Science Extraction from TESS Observations of Known Exoplanet Hosts by Kane, Stephen R, Bean, Jacob L, Campante, Tiago L, Dalba, Paul A, Fetherolf, Tara, Mocnik, Teo, Ostberg, Colby, Pepper, Joshua, Simpson, Emilie R, Turnbull, Margaret C, Ricker, George R, Vanderspek, Roland, Latham, David W, Seager, Sara, Winn, Joshua N, Jenkins, Jon M, Huber, Daniel, Chaplin, William J

“…These include measurements of planetary radii, mass–radius relationships, stellar obliquities, bulk density constraints on interior models, and transmission spectroscopy as a means to study planetary atmospheres. The Transiting Exoplanet Survey Satellite (TESS) has added to the exoplanet inventory by observing a significant fraction of the celestial sphere, including many stars already known to host exoplanets. …”
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The Transiting Exoplanet Survey Satellite by Ricker, George R, Vanderspek, Roland K, Seager, Sara, Levine, Alan M, Villasenor, Jesus N S., Winn, Joshua Nathan, Berta-Thompson, Zach

“…For the first time it will be possible to study the masses, sizes, densities, orbits, and atmospheres of a large cohort of small planets, including a sample of rocky worlds in the habitable zones of their host stars.…”
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Science Extraction from TESS Observations of Known Exoplanet Hosts by Kane, Stephen R, Bean, Jacob L, Campante, Tiago L, Dalba, Paul A, Fetherolf, Tara, Mocnik, Teo, Ostberg, Colby, Pepper, Joshua, Simpson, Emilie R, Turnbull, Margaret C, Ricker, George R, Vanderspek, Roland, Latham, David W, Seager, Sara, Winn, Joshua N, Jenkins, Jon M, Huber, Daniel, Chaplin, William J

“…These include measurements of planetary radii, mass–radius relationships, stellar obliquities, bulk density constraints on interior models, and transmission spectroscopy as a means to study planetary atmospheres. The Transiting Exoplanet Survey Satellite (TESS) has added to the exoplanet inventory by observing a significant fraction of the celestial sphere, including many stars already known to host exoplanets. …”
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TESS Hunt for Young and Maturing Exoplanets (THYME). III. A Two-planet System in the 400 Myr Ursa Major Group by Ricker, George R, Vanderspek, Roland K, Seager, Sara, Glidden, Ana, Villanueva Jr, Steven

“…Exoplanets can evolve significantly between birth and maturity, as their atmospheres, orbits, and structures are shaped by their environment. …”
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Transits of Known Planets Orbiting a Naked-eye Star by Osborn, Hugh P, Ricker, George R, Vanderspek, Roland K, Seager, Sara

“…The combination of the multitransiting planet system, the bright host star, and the diversity of planetary interiors and atmospheres means this will likely become a cornerstone system for atmospheric and orbital characterization of small worlds.…”
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HD 191939: Three Sub-Neptunes Transiting a Sun-like Star Only 54 pc Away by Badenas, Mariona, Günther, Maximilian N., Daylan, Tansu, Mikal-Evans, Thomas, Huang, Chelsea X., Matthews, Elisabeth C, Rackham, Benjamin V, Shporer, Abraham-Avi, Seager, Sara, Ricker, George R, Vanderspek, Roland K, Niraula, Prajwal, Crossfield, Ian Jm, Fausnaugh, Michael

“…Finally, as a promising target for multiwavelength transmission spectroscopy of all three planets' atmospheres, HD 191939 can offer valuable insight into multiple sub-Neptunes born from a protoplanetary disk that may have resembled that of the early Sun.…”
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A remnant planetary core in the hot-Neptune desert by Huang, Chelsea X., Matthews, Elisabeth C, Crossfield, Ian Jm, Fausnaugh, Michael, Günther, Maximilian N., Ricker, George R, Seager, Sara, Sha, Lizhou, Vanderspek, Roland K, Villasenor, Jesus Noel Samonte, Zhan, Zhuchang

“…Although photoevaporation rates cannot account for the mass loss required to reduce a Jupiter-like gas giant, they can remove a small (a few Earth masses) hydrogen and helium envelope on timescales of several billion years, implying that any remaining atmosphere on TOI-849b is likely to be enriched by water or other volatiles from the planetary interior. …”
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Stellar Flares from the First TESS Data Release: Exploring a New Sample of M Dwarfs by Günther, Maximilian N, Zhan, Zhuchang, Seager, Sara, Rimmer, Paul B, Ranjan, Sukrit, Stassun, Keivan G, Oelkers, Ryan J, Daylan, Tansu, Newton, Elisabeth, Kristiansen, Martti H, Olah, Katalin, Gillen, Edward, Rappaport, Saul, Ricker, George R, Vanderspek, Roland K, Latham, David W, Winn, Joshua N, Jenkins, Jon M, Glidden, Ana, Fausnaugh, Michael, Levine, Alan M, Dittmann, Jason A, Quinn, Samuel N, Krishnamurthy, Akshata, Ting, Eric B

“…Flares may erode exoplanets' atmospheres and impact their habitability, but might also trigger the genesis of life around small stars. …”
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A super-Earth and two sub-Neptunes transiting the nearby and quiet M dwarf TOI-270 by Günther, Maximilian N., Dragomir, Diana, Daylan, Tansu, Huang, Chelsea X., Burt, Jennifer A, Matthews, Elisabeth C, Ricker, George R, Vanderspek, Roland K, Seager, Sara, Crossfield, Ian Jm, Fausnaugh, Michael, Furesz, Gabor, Guerrero, Natalia M., Relles, Howard M., Shporer, Abraham-Avi

“…This enables the characterization of planetary sizes, orbits, bulk compositions, atmospheres and formation histories. These studies are facilitated by small and cool M dwarf host stars. …”
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Discovery and Characterization of Transiting Super Earths Using an All-Sky Transit Survey and Follow-up by the James Webb Space Telescope by Seager, Sara, Winn, Joshua Nathan, Deming, Drake, Miller-Ricci, Eliza, Clampin, M., Lindler, D., Greene, Tom, Charbonneau, David, Laughlin, G. P., Latham, David W., Ennico, K., Ricker, George R

“…The principal sources of uncertainty in the prospective JWST characterization of habitable super Earths are super-Earth frequency and the nature of super-Earth atmospheres. Based on our estimates of these uncertainties, we project that JWST will be able to measure the temperature and identify molecular absorptions (water, CO[subscript 2]) in one to four nearby habitable TESS super Earths orbiting lower–main-sequence stars.…”
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THE TRANSITING EXOPLANET SURVEY SATELLITE: SIMULATIONS OF PLANET DETECTIONS AND ASTROPHYSICAL FALSE POSITIVES by Sullivan, Peter W., Charbonneau, David, Deming, Drake, Dressing, Courtney D., Latham, David W., McCullough, Peter R., Morton, Timothy D., Winn, Joshua Nathan, Berta-Thompson, Zach, Woods, Deborah F., Levine, Alan M, Ricker, George R, Vanderspek, Roland K

“…We also discuss the prospects for follow-up observations to measure the masses and atmospheres of the TESS planets.…”
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A giant planet candidate transiting a white dwarf by Vanderburg, Andrew, Rappaport, Saul A, Xu, Siyi, Crossfield, Ian J. M., Becker, Juliette C., Gary, Bruce, Murgas, Felipe, Blouin, Simon, Kaye, Thomas G., Palle, Enric, Melis, Carl, Morris, Brett M., Kreidberg, Laura, Gorjian, Varoujan, Morley, Caroline V., Mann, Andrew W., Parviainen, Hannu, Pearce, Logan A., Newton, Elisabeth R., Carrillo, Andreia, Zuckerman, Ben, Nelson, Lorne, Zeimann, Greg, Brown, Warren R., Tronsgaard, René, Klein, Beth, Ricker, George R, Vanderspek, Roland K, Latham, David W., Seager, Sara, Winn, Joshua N., Jenkins, Jon M., Adams, Fred C., Benneke, Björn, Berardo, David Anthony, Buchhave, Lars A., Caldwell, Douglas A., Christiansen, Jessie L., Collins, Karen A., Colón, Knicole D., Daylan, Tansu, Doty, John, Doyle, Alexandra E., Dragomir, Diana, Dressing, Courtney, Dufour, Patrick, Fukui, Akihiko, Glidden, Ana, Guerrero, Natalia M., Guo, Xueying, Heng, Kevin, Henriksen, Andreea I., Huang, Chelsea X., Kaltenegger, Lisa, Kane, Stephen R., Lewis, John A., Lissauer, Jack J., Morales, Farisa, Narita, Norio, Pepper, Joshua, Rose, Mark E., Smith, Jeffrey C., Stassun, Keivan G., Yu, Liang

“…Some white dwarfs show evidence for rocky material floating in their atmospheres5, in warm debris disks6–9 or orbiting very closely10–12, which has been interpreted as the debris of rocky planets that were scattered inwards and tidally disrupted13. …”
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TESS Observations of the WASP-121 b Phase Curve by Daylan, Tansu, Günther, Maximilian N, Mikal-Evans, Thomas, Sing, David K, Wong, Ian, Shporer, Avi, Niraula, Prajwal, Wit, Julien de, Koll, Daniel DB, Parmentier, Vivien, Fetherolf, Tara, Kane, Stephen R, Ricker, George R, Vanderspek, Roland, Seager, S, Winn, Joshua N, Jenkins, Jon M, Caldwell, Douglas A, Charbonneau, David, Henze, Christopher E, Paegert, Martin, Rinehart, Stephen, Rose, Mark, Sha, Lizhou, Quintana, Elisa, Villasenor, Jesus Noel

“…We then perform an atmospheric retrieval analysis to infer the dayside atmospheric properties of WASP-121 b, such as its bulk composition, albedo, and heat recirculation. …”
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TESS Observations of the WASP-121 b Phase Curve by Daylan, Tansu, Günther, Maximilian N, Mikal-Evans, Thomas, Sing, David K, Wong, Ian, Shporer, Avi, Niraula, Prajwal, Wit, Julien de, Koll, Daniel DB, Parmentier, Vivien, Fetherolf, Tara, Kane, Stephen R, Ricker, George R, Vanderspek, Roland, Seager, S, Winn, Joshua N, Jenkins, Jon M, Caldwell, Douglas A, Charbonneau, David, Henze, Christopher E, Paegert, Martin, Rinehart, Stephen, Rose, Mark, Sha, Lizhou, Quintana, Elisa, Villasenor, Jesus Noel

“…We then perform an atmospheric retrieval analysis to infer the dayside atmospheric properties of WASP-121 b, such as its bulk composition, albedo, and heat recirculation. …”
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TESS Phase Curve of the Hot Jupiter WASP-19b by Wong, Ian, Benneke, Björn, Shporer, Abraham-Avi, Fetherolf, Tara, Kane, Stephen R., Ricker, George R, Vanderspek, Roland K, Seager, Sara, Winn, Joshua N., Collins, Karen A., Mireles, Ismael, Morris, Robert, Tenenbaum, Peter, Ting, Eric B., Rinehart, Stephen, Villasenor, Jesus Noel Samonte

“…We measure a secondary eclipse depth of 470[subscript -110][superscript +130] ppm and detect a strong atmospheric brightness modulation signal with a semiamplitude of 319 ± 51 ppm. …”
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The Multiplanet System TOI-421 by Ricker, George R, Vanderspek, Roland K, Seager, Sara, Fausnaugh, Michael, Guerrero, Natalia M., Mireles, Ismael, Niraula, Prajwal

“…TOI-421 b and TOI-421 c are found to be well-suited for atmospheric characterization. Our atmospheric simulations predict significant Lyα transit absorption, due to strong hydrogen escape in both planets, as well as the presence of detectable CH4 in the atmosphere of TOI-421 c if equilibrium chemistry is assumed.…”
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