High contrast imaging at 10 microns, a search for exoplanets around: Eps Indi A, Eps Eri, Tau Ceti, Sirius A and Sirius B

Pathak, P.; de la Roche, D. J. M. Petit dit; Kasper, M.; Sterzik, M.; Absil, O.; Boehle, A.; Feng, F.; Ivanov, V. D.; Janson, M.; Jones, H. R. A.; Kaufer, A.; Käufl, H. -U.; Maire, A. -L.; Meyer, M.; Pantin, E.; Siebenmorgen, R.; Ancker, M. E. van den; Viswanath, G.

doi:10.48550/arxiv.2104.13032

Cited by 7 publications

(8 citation statements)

References 7 publications

(7 reference statements)

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“…A planet with a period P = 7.37 ± 0.07 yr of similar mass but a nearly circular orbit was confirmed by Mawet et al (2019). The prominent dusty debris disk of ǫ Eri has an inner radius of ∼ 30 au (Greaves et al 1998) possibly caused by another giant planet at this distance (Hatzes et al 2000)-however, no such object has been found by direct imaging (Pathak et al 2021).…”

Section: The Planet Of ǫ Erimentioning

confidence: 92%

Looking for astrometric signals below 20 m/s: A Jupiter-mass planet signature in $ε$ Eri

Makarov,

Zacharias,

Finch

2021

Preprint

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The USNO ground-based astrometric program URAT-Bright in combination with the Hipparcos mission epoch astrometry provides precise proper motions of a thousand bright stars in the southern hemisphere on a time basis of about 25 years. Small but statistically significant differences between these proper motions and Gaia EDR3 data can reveal long-period exoplanets similar to Jupiter in the nearest star systems. The presence of such a planet orbiting the magnetically active dwarf ǫ Eri is confirmed from both URAT-Hipparcos-EDR3 data and Hipparcos-EDR3 data with a corresponding projected velocity of (+5, +8) and (+6, +13) m s −1 , respectively. These signals are formally significant at a 0.989 and 1.0 confidence. We conclude that the newest astrometric results confirm the existence of a long-period exoplanet orbiting ǫ Eri, which was marginally detected from precision radial velocity measurements some 20 years ago.

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Section: The Planet Of ǫ Erimentioning

confidence: 92%

Looking for astrometric signals below 20 m/s: A Jupiter-mass planet signature in $ε$ Eri

Makarov,

Zacharias,

Finch

2021

Preprint

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“…Two of the stars are known to host Jupiter-like planets, namely Eri b (1.56MJ orbiting at 3.39 au, Hatzes et al 2000;Benedict et al 2006;Mawet et al 2019) andInd b (3.25MJ orbiting at 11.55 au, Feng et al 2019), detected via radial velocity observations. Recent high-contrast imaging at 10µm by Pathak et al (2021) with VISIR were not able to directly detect these planets. Eri is still surrounded by a debris disk with an estimated age of 0.4 Gyr.…”

Section: Description Of Samplementioning

confidence: 98%

Charting nearby stellar systems: The intensity of Galactic cosmic rays for a sample of solar-type stars

Rodgers-Lee,

Vidotto,

Mesquita

2021

Preprint

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Cosmic rays can penetrate planetary atmospheres driving the formation of prebiotic molecules, which are important for the origin of life. We calculate the Galactic cosmic ray fluxes in the habitable zone of five nearby, well-studied solar-type stars and at the orbits of 2 known exoplanets. We model the propagation of Galactic cosmic rays through the stellar winds using a combined 1.5D stellar wind and 1D cosmic ray transport model.We find that the habitable zone of 61 Cyg A has comparable Galactic cosmic ray fluxes to present-day Earth values. For the other four systems ( Eri, Ind, ξ Boo B and π 1 UMa), the fluxes are orders of magnitude smaller than Earth values. Thus, it is unlikely that any as-of-yet undetected Earth-like planets in their habitable zones would receive a higher radiation dose than is received on Earth. Ind b, a Jupiter-like planet orbiting at ∼11 au, receives higher Galactic cosmic ray fluxes than Earth. We find the suppression of Galactic cosmic rays is influenced by whether diffusion or advection dominates at GeV energies and at distances where the wind has reached its' terminal velocity. For advectively-dominated winds (∼younger systems), varying the astrospheric size influences the suppression significantly. For diffusion-dominated systems (∼older systems) the astrospheric size, and therefore knowledge of the ISM properties, are not very important. This reduces the Galactic cosmic ray flux uncertainties in the habitable zone for diffusion-dominated systems. Whether a system is advection-or diffusion-dominated can be determined from the stellar wind properties.

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“…While reflected light imaging [e.g., 46] will also enable the study of many of these same planets, its combination with mid-IR imaging is needed to break the degeneracy between radius and albedo. Indeed, such observations have already started to place limits on the properties of planets within a handful of systems [e.g., 16,[47][48][49].…”

Section: Exoplanet Science With High-contrast Mid-ir Imagingmentioning

confidence: 99%

Imaging low-mass planets within the habitable zones of nearby stars with ground-based mid-infrared imaging

Wagner¹,

Stone²,

Leisenring³

et al. 2021

Preprint

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Giant exoplanets on 10-100 au orbits have been directly imaged around young stars. The peak of the thermal emission from these warm young planets is in the near-infrared (∼1-5 µm), whereas mature, temperate exoplanets (i.e., those within their stars' habitable zones) radiate primarily in the mid-infrared (mid-IR: ∼10 µm). If the background noise in the mid-IR can be mitigated, then exoplanets with low masses-including rocky exoplanets-can potentially be imaged in very deep exposures. Here, we review the recent results of the Breakthrough Watch/New Earths in the Alpha Centauri Region (NEAR) program on the Very Large Telescope (VLT) in Chile. NEAR pioneered a ground-based mid-IR observing approach designed to push the capabilities for exoplanet imaging with a specific focus on the closest stellar system, α Centauri. NEAR combined several new optical technologies-including a mid-IR optimized coronagraph, adaptive optics system, and rapid chopping strategy to mitigate noise from the central star and thermal background within the habitable zone. We focus on the lessons of the VLT/NEAR campaign to improve future instrumentation−specifically on strategies to improve noise mitigation through chopping. We also present the design and commissioning of the Large Binocular Telescope's Exploratory Survey for Super-Earths Orbiting Nearby Stars (LESSONS), an experiment in the Northern hemisphere that is building on what was learned from NEAR to further push the sensitivity of mid-IR imaging. Finally, we briefly discuss some of the possibilities that mid-IR imaging will enable for exoplanet science.

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High contrast imaging at 10 microns, a search for exoplanets around: Eps Indi A, Eps Eri, Tau Ceti, Sirius A and Sirius B

Cited by 7 publications

References 7 publications

Looking for astrometric signals below 20 m/s: A Jupiter-mass planet signature in $ε$ Eri

Looking for astrometric signals below 20 m/s: A Jupiter-mass planet signature in $ε$ Eri

Charting nearby stellar systems: The intensity of Galactic cosmic rays for a sample of solar-type stars

Imaging low-mass planets within the habitable zones of nearby stars with ground-based mid-infrared imaging

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