Results 41 to 50 of about 1,052,332 (366)

Characterization of the HD 17156 planetary system [PDF]

, 2008
AIMS : To improve the parameters of the HD 17156 system (peculiar due to the eccentric and long orbital period of its transiting planet) and constrain the presence of stellar companions. METHODS : Photometric data were acquired for 4 transits, and high
A. F. Martinez Fiorenzano, A. Sozzetti, Allen, Alonso, B. Loeillet, Baraffe, Barbieri, Carpenter, Cecconi, Charbonneau, Charbonneau, Claret, Cochran, D. Charbonneau, da Silva, Dehnen, Delfosse, Desidera, Endl, Fischer, Fortney, G. Laughlin, Gillon, Giménez, Giménez, Girardi, Gonzalez, Gonzalez, Gonzalez, Gonzalez, Gonzalez, Gratton, Henry, Hébrard, Irwin, Israelian, J. M. Almenara, Johnson, Kervella, Kopal, Loeillet, M. Barbieri, M. Cecconi, M. Endl, Malkov, Malkov, Mamajek, Marois, Martínez Fiorenzano, Marzari, McLaughlin, Murray, Narita, Neuforge-Verheecke, Nidever, Nordström, Pasquini, R. Alonso, R. Gratton, R. U. Claudi, Ramírez, Reddy, Rossiter, S. Desidera, Santos, Santos, Schlesinger, Sestito, Sousa, Sozzetti, Sozzetti, the Exoplanet Amateur Consortium, Tinetti, V. Granata, Valenti, van Leeuwen, Voges   +76 more
core   +4 more sources

The birth environment of planetary systems [PDF]

Royal Society Open Science, 2020
Star and planet formation are inextricably linked. In the earliest phases of the collapse of a protostar, a disc forms around the young star and such discs are observed for the first several million years of a star’s life. It is within these circumstellar, or protoplanetary, discs that the first stages of planet formation occur.
openaire   +6 more sources

Dynamical Habitability of Planetary Systems [PDF]

Astrobiology, 2010
The problem of the stability of planetary systems, a question that concerns only multiplanetary systems that host at least two planets, is discussed. The problem of mean motion resonances is addressed prior to discussion of the dynamical structure of the more than 350 known planets.
Dvorak, Rudolf, Pilat-Lohinger, Elke, Bois, Eric, Schwarz, Richard, Funk, Barbara, Beichman, Charles, Danchi, William, Eiroa, Carlos, Fridlund, Malcolm, Henning, Thomas, Herbst, Tom, Kaltenegger, Lisa, Lammer, Helmut, Léger, Alain, Liseau, René, Lunine, Jonathan, Paresce, Francesco, Penny, Alan, Quirrenbach, Andreas, Röttgering, Huub, Selsis, Franck, Schneider, Jean, Stam, Daphne, Tinetti, Giovanna, White, Glenn J.   +24 more
openaire   +6 more sources

Mechanical planetary compensating drive system [PDF]

, 1973
Drive enables two concentric output shafts to be controlled independently or rotated as a unit. Possible uses are pointing and tracking devices, rotary camera shutters with variable light control, gimbal systems with yaw and pitch movement, spectrometer ...
Gerdts, J. C., Jr., Zeiger, R. J.
core   +1 more source

Earth-like Habitats in Planetary Systems

, 2014
Understanding the concept of habitability is related to an evolutionary knowledge of the particular planet-in-question. Additional indications so-called "systemic aspects" of the planetary system as a whole governs a particular planet's claim on ...
Bitsch, Bertram, Fernandes, Vera A., Fritz, Jörg, Grenfell, Lee J., Kührt, Ekkehard, Morbidelli, Alessandro, Rauer, Heike, Tornow, Carmen, Wagner, Roland, Werner, Stephanie C., Wünnemann, Kai   +10 more
core   +1 more source

Structural and mechanistic basis for the regulation of the chloroplast signal recognition particle by (p)ppGpp

FEBS Letters, EarlyView.
LHCPs are transported to the thylakoid membrane via the (cp)SRP pathway. This process involves a transit complex of (cp)SRP43, (cp)SRP54 and LHCP, which interacts with (cp)FtsY and Alb3 at the membrane. GTP hydrolysis by (cp)SRP54 and (cp)FtsY triggers complex dissociation.
Victor Zegarra, Paul Weiland, Pauline Anka Plitzko, Julia Thiery, Laura Czech, Felix Willmund, Patricia Bedrunka, Gert Bange   +7 more
wiley   +1 more source

A probable ancient nearshore zone in southern Utopia on Mars unveiled from observations at the Zhurong landing area

Scientific Reports
The Chinese Mars rover Zhurong successfully landed in southern Utopia Planitia on Mars in May 2021. Previous research suggested a Hesperian ocean may have existed in the northern lowland on Mars.
Bo Wu, Jie Dong, Yiran Wang, Wei Rao, Zezhou Sun, Sergey Krasilnikov, Zhaojin Li, Zhiyun Tan, Zeyu Chen, Chuang Wang, Mikhail Ivanov, Jiaming Zhu, Wai Chung Liu, Long Chen, Hongliang Li   +14 more
doaj   +1 more source

Bark Transpiration Rates Can Reach Needle Transpiration Rates Under Dry Conditions in a Semi-arid Forest

Frontiers in Plant Science, 2021
Drought can cause tree mortality through hydraulic failure and carbon starvation. To prevent excess water loss, plants typically close their stomata before massive embolism formation occurs.
Anna Lintunen, Anna Lintunen, Yakir Preisler, Itay Oz, Dan Yakir, Timo Vesala, Timo Vesala, Timo Vesala, Teemu Hölttä   +8 more
doaj   +1 more source

Modeling the resonant planetary system GJ876

, 2005
The two planets about the star GJ 876 appear to have undergone extensive migration from their point of origin in the protoplanetary disk -- both because of their close proximity to the star (30 and 60 day orbital periods) and because of their occupying ...
Bate, Beaugé, Beaugé, Benedict, Bryden, Bryden, D'Angelo, D'Angelo, D'Angelo, Delfosse, Duncan, Ferraz-Mello, Goldreich, Günther, Hubeny, Kley, Kley, Kley, Kley, Kley, Laughlin, Lee, Lee, Lubow, M. H. Lee, Marcy, Marcy, Marcy, Mayor, McArthur, Murray, N. Murray, Nelson, Nelson, Ogilvie, Papaloizou, Papaloizou, Rivera, S. J. Peale, Snellgrove, van Leer, Varnière, W. Kley, Ward, Ward, Yoder   +45 more
core   +1 more source

A planetary system with an escaping Mars [PDF]

Astronomische Nachrichten, 2007
AbstractThe chaotic behaviour of the motion of the planets in our Solar System is well established. In this work to model a hypothetical extrasolar planetary system our Solar System was modified in such a way that we replaced the Earth by a more massive planet and let the other planets and all the orbital elements unchanged.
Suli, A, Dvorak, R
openaire   +6 more sources