exo planets
... On April 17, 2014, NASA made an historic announcement – the first discovery of an Earth-sized planet orbiting in the Goldilocks Zone of another star. The planet may have the potential for life to exist. The world circles a red dwarf star in the constellation of Cygnus and is about 500 light years aw ...
... On April 17, 2014, NASA made an historic announcement – the first discovery of an Earth-sized planet orbiting in the Goldilocks Zone of another star. The planet may have the potential for life to exist. The world circles a red dwarf star in the constellation of Cygnus and is about 500 light years aw ...
The Discovery of Planets beyond the Solar System
... in the disk, and through sticky collisions, it forms gravel, pebbles, rocks and so on, all the way to planetesimals and planets, .At the end, planet formation shuts down when the bright light from the infant star dissipates the gaseous disk. ...
... in the disk, and through sticky collisions, it forms gravel, pebbles, rocks and so on, all the way to planetesimals and planets, .At the end, planet formation shuts down when the bright light from the infant star dissipates the gaseous disk. ...
... the habitable zone. The simulations were performed using a 1-D photochemical model. We simulated six atmospheres with high concentrations of CO2 and CH4 . The response of atmospheric chemistry to the variation of the ultraviolet (UV) radiation from its star, in cases where the atmosphere contains a ...
Lecture 34: Habitable Zones around Stars
... Region around the Sun where liquid water is stable on the surface of a planet at a pressure of 1 atmosphere. ...
... Region around the Sun where liquid water is stable on the surface of a planet at a pressure of 1 atmosphere. ...
PLANETS
... It has a very large field of view for an astronomical telescope —105 square degrees— or about the area of both your hands held at arm's length, in order to observe the necessary large number of stars. It stares at the same star field for the entire mission and continuously and simultaneously monitor ...
... It has a very large field of view for an astronomical telescope —105 square degrees— or about the area of both your hands held at arm's length, in order to observe the necessary large number of stars. It stares at the same star field for the entire mission and continuously and simultaneously monitor ...
On the probability of habitable planets.
... Earth masses)” and Bonfils et al. (2013) calculated that about 50% or more M dwarf stars should have terrestrial planets (>1-10 Earth masses) with orbit period between 10 and 100 days. Similarly, using only Kepler's first 4 months of data, Borucki et al. (2011) estimated that the frequency of stars ...
... Earth masses)” and Bonfils et al. (2013) calculated that about 50% or more M dwarf stars should have terrestrial planets (>1-10 Earth masses) with orbit period between 10 and 100 days. Similarly, using only Kepler's first 4 months of data, Borucki et al. (2011) estimated that the frequency of stars ...
Can Earth-Type Habitable Planets Exist Around 47 UMa?
... 47 UMa hosts two Jupiter-mass planets in nearly circular orbits at respectable distances from the host star (i.e., 2.09 and 3.73 AU; see Butler & Marcy 1996; Fischer et al. 2002). Second, it is known that there are no Jupiter-mass planets in the inner region around the star. Third, it is found that ...
... 47 UMa hosts two Jupiter-mass planets in nearly circular orbits at respectable distances from the host star (i.e., 2.09 and 3.73 AU; see Butler & Marcy 1996; Fischer et al. 2002). Second, it is known that there are no Jupiter-mass planets in the inner region around the star. Third, it is found that ...
L53 SNOWBALL PLANETS AS A POSSIBLE TYPE OF WATER
... Terrestrial planets with abundant water have multiple climate modes, including an ice-free, a partially icecovered, and a globally ice-covered state. Recent geological studies have revealed that the Earth experienced global glaciations in its history (“snowball Earth” hypothesis). In the snowball gl ...
... Terrestrial planets with abundant water have multiple climate modes, including an ice-free, a partially icecovered, and a globally ice-covered state. Recent geological studies have revealed that the Earth experienced global glaciations in its history (“snowball Earth” hypothesis). In the snowball gl ...
The first cool rocky/icy exoplanet
... host star. But because these planets had to be large to cause an observable Doppler shift, the planetary systems revealed were unlike the solar system; astronomers were faced with massive gas giants in close orbits around their host star. By January 2006, about 170 extrasolar planets were known, of ...
... host star. But because these planets had to be large to cause an observable Doppler shift, the planetary systems revealed were unlike the solar system; astronomers were faced with massive gas giants in close orbits around their host star. By January 2006, about 170 extrasolar planets were known, of ...
A rocky planet transiting a nearby low-mass star
... M-dwarf stars – hydrogen-burning stars that are smaller than 60 per cent of the size of the Sun – are the most common class of star in our Galaxy and outnumber Sun-like stars by a ratio of 12:1. Recent results have shown that M dwarfs host Earth-sized planets in great numbers1,2 : the average number ...
... M-dwarf stars – hydrogen-burning stars that are smaller than 60 per cent of the size of the Sun – are the most common class of star in our Galaxy and outnumber Sun-like stars by a ratio of 12:1. Recent results have shown that M dwarfs host Earth-sized planets in great numbers1,2 : the average number ...
How common are habitable planets?
... brightness. From among the 150,000 stars were Earth-size, that is, one to two times the photographed every 30 minutes for four years, diameter of Earth and orbiting their star at a NASA's Kepler team reported more than 3,000 distance where they are heated to lukewarm planet candidates. Many of these ...
... brightness. From among the 150,000 stars were Earth-size, that is, one to two times the photographed every 30 minutes for four years, diameter of Earth and orbiting their star at a NASA's Kepler team reported more than 3,000 distance where they are heated to lukewarm planet candidates. Many of these ...
Earth-like worlds on eccentric orbits - Physics
... An important uncertainty here is the CO2 cloud lifetime, which might be short if the cloud particles snow out on to the surface soon after forming, as occurs on Mars today. The seasonal sequestering of CO2 at the Martian poles is enough to cause atmospheric pressures to vary in the Martian atmospher ...
... An important uncertainty here is the CO2 cloud lifetime, which might be short if the cloud particles snow out on to the surface soon after forming, as occurs on Mars today. The seasonal sequestering of CO2 at the Martian poles is enough to cause atmospheric pressures to vary in the Martian atmospher ...
Is there life outside of Earth? Activity 2: Moving Stars and Their Planets
... The mass of the student-created planet is given in the upper right-hand corner of the model in multiples of Earth’s mass. Encourage your students to test different combinations of rocky planet and planet diameter to understand rocky planets and gaseous planets of the same size can have different eff ...
... The mass of the student-created planet is given in the upper right-hand corner of the model in multiples of Earth’s mass. Encourage your students to test different combinations of rocky planet and planet diameter to understand rocky planets and gaseous planets of the same size can have different eff ...
Lecture8_2014_v2 - UCO/Lick Observatory
... – As seen from the nearest star, Alpha Centauri, Jupiter would appear a billionth as bright as the Sun. – Jupiter would also be extremely close to the Sun, only 4 arc sec away. ...
... – As seen from the nearest star, Alpha Centauri, Jupiter would appear a billionth as bright as the Sun. – Jupiter would also be extremely close to the Sun, only 4 arc sec away. ...
BENNETT, Constraints on the Orbital Motion of OGLE-2006
... – 2-d positions and velocities are well determined – Orbital period is constrained, but not fixed by the light curve – The orbital period parameter can be interpreted as acceleration or 3-d Star-Saturn distance (via a = GM/r2) ...
... – 2-d positions and velocities are well determined – Orbital period is constrained, but not fixed by the light curve – The orbital period parameter can be interpreted as acceleration or 3-d Star-Saturn distance (via a = GM/r2) ...
Testing
... – Transiting planets periodically reduce a star’s brightness – Direct detection is possible if we can block the star’s bright light ...
... – Transiting planets periodically reduce a star’s brightness – Direct detection is possible if we can block the star’s bright light ...
Extrasolar Planetary Systems » American Scientist
... a planet circling 51 Pegasi, a nearby star not all that different from the Sun. The planet, they claimed, is roughly 150 times more massive than Earth and travels in an orbit that takes only 4.2 days to complete. When the announcement was made at a scientific conference in Italy, the general reactio ...
... a planet circling 51 Pegasi, a nearby star not all that different from the Sun. The planet, they claimed, is roughly 150 times more massive than Earth and travels in an orbit that takes only 4.2 days to complete. When the announcement was made at a scientific conference in Italy, the general reactio ...
Lecture 09
... • The planet around 51 Pegasi has a mass similar to Jupiter’s, despite its small orbital distance. • This is strange. • The Nebula Model says gas giants form beyond the frost line, but this planet orbits really close to its star where it could not have formed. ...
... • The planet around 51 Pegasi has a mass similar to Jupiter’s, despite its small orbital distance. • This is strange. • The Nebula Model says gas giants form beyond the frost line, but this planet orbits really close to its star where it could not have formed. ...
Probing the Atmospheres of Exoplanets
... there should be additional contributions by the observatory’s two new instruments, the Cosmic Origins Spectrograph (COS) and Wide Field Camera 3 (WFC3), which also has a near-infrared grism. With these instruments operating, the number of molecules discovered is expected to grow rapidly. Eventually, ...
... there should be additional contributions by the observatory’s two new instruments, the Cosmic Origins Spectrograph (COS) and Wide Field Camera 3 (WFC3), which also has a near-infrared grism. With these instruments operating, the number of molecules discovered is expected to grow rapidly. Eventually, ...
Extrasolar Planets - University of Maryland Astronomy
... At that point the race was on. As of October 30, 2009, 403 extrasolar planets had been discovered (for an indication of the pace of discovery, a year ago there were 313 known!). There are 45 multiple-planet systems (20 were known a year ago), with the current record holder (the system around 55 Canc ...
... At that point the race was on. As of October 30, 2009, 403 extrasolar planets had been discovered (for an indication of the pace of discovery, a year ago there were 313 known!). There are 45 multiple-planet systems (20 were known a year ago), with the current record holder (the system around 55 Canc ...
Giant planets in debris disks around nearby stars
... [4, 3] and comparing the expected star – planet contrasts to the contrast curve derived by [14] for NaCo-AGPMPCA-ADI for a ≈6 mag star under moderate weather conditions (applying a simplified scaling to tint = 2.5 hrs and ∆PA=90deg). Figure 4 shows that we will be sensitive to 5 MJup -mass planets a ...
... [4, 3] and comparing the expected star – planet contrasts to the contrast curve derived by [14] for NaCo-AGPMPCA-ADI for a ≈6 mag star under moderate weather conditions (applying a simplified scaling to tint = 2.5 hrs and ∆PA=90deg). Figure 4 shows that we will be sensitive to 5 MJup -mass planets a ...
WASP-24b: A New Transiting Close-in Hot Jupiter
... diverse set of close-in giant planets. The last few years have seen the discovery of a number of so-called ‘bloated’ close-in Jovian planets, for example WASP-17 b (Anderson et al. 2010) and Kepler-7 b (Latham et al. 2010). The very low densities of these objects present an ongoing challenge to theo ...
... diverse set of close-in giant planets. The last few years have seen the discovery of a number of so-called ‘bloated’ close-in Jovian planets, for example WASP-17 b (Anderson et al. 2010) and Kepler-7 b (Latham et al. 2010). The very low densities of these objects present an ongoing challenge to theo ...
ph709-08-3b - Centre for Astrophysics and Planetary Science
... mode, which is used for targets in the brightness range 6.5>=V>=13. We describe the photometric reduction techniques for this mode of observing, in particular the corrections for stray earthshine. We do not detect the secondary eclipse in the MOST data, to a limit in depth of 0.053 mmag (1 sigma). W ...
... mode, which is used for targets in the brightness range 6.5>=V>=13. We describe the photometric reduction techniques for this mode of observing, in particular the corrections for stray earthshine. We do not detect the secondary eclipse in the MOST data, to a limit in depth of 0.053 mmag (1 sigma). W ...
Santos: On the relation between stars and their planets
... Results from the analysis of the HARPS sample Recent statistical analysis: both solutions have equal significance! ...
... Results from the analysis of the HARPS sample Recent statistical analysis: both solutions have equal significance! ...
Habitability and Stability of Orbits for Earth
... range of stellar age. For a continental area of more than 90% of the total surface, no habitable solutions also meeting the requirement of orbital stability exist. In general, we can state that nding an Earth-like habitable extrasolar planet is the more promising the younger the system and the lowe ...
... range of stellar age. For a continental area of more than 90% of the total surface, no habitable solutions also meeting the requirement of orbital stability exist. In general, we can state that nding an Earth-like habitable extrasolar planet is the more promising the younger the system and the lowe ...
Gliese 581
Gliese 581 (/ˈɡliːzə/) is a star of spectral type M3V (a red dwarf) about 20 light years away from Earth in the constellation Libra. Its estimated mass is about a third of that of the Sun, and it is the 89th closest known star to the Sun. Observations suggest that the star has a planetary system consisting of three known planets, designated Gliese 581 b, c, and e and a possibly confirmed planet, d, in order of discovery. Additional outer planets, which received the designations Gliese 581 f, and g have been proposed, but the evidence that led to the discovery claims has been shown to be the result of stellar activity mimicking the radial velocity variations due to orbiting planets.Gliese 581 has been the subject of a ""huge amount of attention"" in the quest to discover the first habitable extrasolar planet; first for c, and then d and g. Gliese 581 c, the first low-mass extrasolar planet found near a habitable zone, was discovered in April 2007. It has since been shown that under known terrestrial planet climate models, Gliese 581 c is likely to have a runaway greenhouse effect, and hence is probably too hot to be habitable, analogous to Venus. The proposed planets Gliese 581 d and Gliese 581 g also received attention as being located within the habitable zone, but their existence has subsequently been put into doubt by some authors.On 27 November 2012, the European Space Agency announced a debris disk, with at least ten times as many comets as the Solar System. This put constraints on possible planets beyond 0.75 AU.