TESS News and Results

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TESS News and Results

Post by Sirius_Alpha on 2nd July 2018, 10:04 pm

Alright, as we all know, the TESS (Transiting Exoplanet Survey Satellite) mission is in space, and they've reached their science orbit. So we may as well start a TESS news and results thread. To commission it, there's great news on the fuel consumption.

https://twitter.com/LucaPlanets/status/1013707975058485248
The orbit adjust burns of @NASA_TESS were 10 times more precise than expected! It was so good that the spacecraft has fuel for >20 years of stable operations (!!) #Exoplanets2

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Re: TESS News and Results

Post by Led_Zep on 2nd July 2018, 10:53 pm

Good news ! But the problem with Kepler was reaction wheels...
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Re: TESS News and Results

Post by Sirius_Alpha on 28th July 2018, 12:53 am

After an extended commissioning period, TESS is now conducting normal science observations.
https://tess.mit.edu/news/nasas-tess-spacecraft-starts-science-operations/

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Re: TESS News and Results

Post by Sirius_Alpha on 1st September 2018, 12:01 pm


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Re: TESS News and Results

Post by Led_Zep on 3rd September 2018, 10:30 am

Twitter :

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Re: TESS News and Results

Post by Sirius_Alpha on 6th September 2018, 8:35 pm

Some transiting planet candidates detected from the ground in Antarctica, and in TESS's continuous viewing zone.

Exoplanets in the Antarctic sky. II. 116 Transiting Exoplanet Candidates found by AST3-II (CHESPA) within the Southern CVZ of TESS
https://arxiv.org/abs/1809.01789

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Re: TESS News and Results

Post by Sirius_Alpha on 17th September 2018, 8:34 pm

TESS's first planet discovery!!

TESS Discovery of a Transiting Super-Earth in the Π Mensae System
https://arxiv.org/abs/1809.05967

We report the detection of a transiting planet around π Mensae (HD\,39091), using data from the Transiting Exoplanet Survey Satellite (TESS). The solar-type host star is unusually bright (V=5.7) and was already known to host a Jovian planet on a highly eccentric, 5.7-year orbit. The newly discovered planet has a size of 2.14 0.04~R⊕ and an orbital period of 6.27 days. Radial-velocity data from the HARPS and AAT/UCLES archives also displays a 6.27-day periodicity, confirming the existence of the planet and leading to a mass determination of 4.82 0.85~M⊕. The star's proximity and brightness will facilitate further investigations, such as atmospheric spectroscopy, asteroseismology, the Rossiter-McLaughlin effect, astrometry, and direct imaging.

Following the Kepler naming scheme for objects of interest, π Men c is also known as TOI-144.01, which in itself tells you they may have already at least 143 more transiting planet candidates already that are awaiting confirmation.

Also, on the potential detection of π Men b with Gaia, they note that it will take the full five year mission to achieve a detection of 10σ, but,
Ranalli et al. (2018) predicted that the astrometric signal of π Men b will be detectable with a signal-to-noise ratio higher than 10 by the end of the mission. Indeed, the fit to the existing Gaia data exhibits an excess scatter of 295 " (37σ), perhaps a hint of planet-induced motion

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Re: TESS News and Results

Post by Edasich on 18th September 2018, 4:31 am

Notable discovery. Certainly there's much more to reveal... Very Happy
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Re: TESS News and Results

Post by Edasich on 20th September 2018, 4:07 am

It's quite time for TESS results...

TESS Discovery of an ultra-short-period planet around the nearby M dwarf LHS 3844

Data from the newly-commissioned Transiting Exoplanet Survey Satellite (TESS) has revealed a "hot Earth" around LHS 3844, an M dwarf located 15 pc away. The planet has a radius of 1.320.02 R⊕ and orbits the star every 11 hours. Although the existence of an atmosphere around such a strongly irradiated planet is questionable, the star is bright enough (I=11.9, K=9.1) for this possibility to be investigated with transit and occultation spectroscopy. The star's brightness and the planet's short period will also facilitate the measurement of the planet's mass through Doppler spectroscopy.
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Re: TESS News and Results

Post by Lazarus on 20th September 2018, 12:55 pm

Wonder if there will be a TESS-number system like Kepler, e.g. TESS-1c, TESS-2b, etc.

Given that ultra-short-period planets seem to often be in multi-planet systems, it will be interesting to see what future updates will happen for LHS 3844.
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Re: TESS News and Results

Post by Sirius_Alpha on 20th September 2018, 6:23 pm

Lazarus wrote:Wonder if there will be a TESS-number system like Kepler, e.g. TESS-1c, TESS-2b, etc.
Maybe I'm weird, but I honestly hope not, given how bright the TESS planet hosts will be, at least in the short-cadence. I would rather them just stick with whatever star names are available. Imagine 70 Oph being redesignated TESS-#, ... as if anyone is going to remember the star by that name. I think the TOI identifier would be adequate especially for the much dimmer planet hosts that get detected in the full-frame, longer-cadence images.

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Re: TESS News and Results

Post by Led_Zep on 20th September 2018, 10:16 pm

Same planet but another team :

TESS's first planet : a super-Earth transiting the naked-eye star π Mensae

https://arxiv.org/abs/1809.07573

page 1 :

"...Following a successful commissioning of 3 months, TESS
started the science operation on 25 July 2018 by photometrically
monitoring its first sector (Sector 1), which is centered
at coordinates = 352.68,  = 􀀀64.85 (J2000). Shortly after
30 days of (almost) continuous observations in Sector 1, 73
transiting planet candidates were detected
in the 2-min cadence
light curves by the TESS team and made available to the scientific
community through a dedicated web portal hosted at the
Massachusetts Institute of Technology (MIT) web page..."
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Re: TESS News and Results

Post by tommi59 on 21st September 2018, 3:19 am

Quite difference in planet radius in this paper 1.84 .Density suggests envelope but is it water or hydrogen ?`I did not expect any of them so close around G star
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Re: TESS News and Results

Post by Lazarus on 21st September 2018, 3:15 pm

Sirius_Alpha wrote:Maybe I'm weird, but I honestly hope not, given how bright the TESS planet hosts will be, at least in the short-cadence. I would rather them just stick with whatever star names are available. Imagine 70 Oph being redesignated TESS-#, ... as if anyone is going to remember the star by that name. I think the TOI identifier would be adequate especially for the much dimmer planet hosts that get detected in the full-frame, longer-cadence images.
Good point.

Although, if the 40 Eri Ab discovery is anything to go by, they'd just call it HD 165341. Because that's FAR more memorable.
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Re: TESS News and Results

Post by Lazarus on 3rd October 2018, 3:58 pm

There does seem to be a bit of controversy going on with the early results, e.g. why the two papers about Pi Mensae c ended up with different planetary radii...

https://twitter.com/benmontet/status/1043222872834170881
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Re: TESS News and Results

Post by Led_Zep on 4th October 2018, 5:50 pm

https://archive.stsci.edu/prepds/tess-data-alerts/

Data Products From TESS Data Alerts ("TESS-DATA-ALERTS")

A total of 44 high-quality planet candidates in Sector 1 were initially selected from the two-minute cadence data for follow-up observations by the TESS Follow-Up Program (TFOP).
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Re: TESS News and Results

Post by Sirius_Alpha on 4th October 2018, 8:31 pm

Several of these are already-known planets. In order of how they appeared in that table,

TOI-114 = WASP-126
TOI-109 = HATS-14
TOI-106 = WASP-100
TOI-126 = WASP-112
TOI-107 = WASP-94 A
TOI-113 = WASP-124
TOI-105 = WASP-95
TOI-102 = WASP-62
TOI-101 = WASP-46
TOI-104 = WASP-73
TOI-116 = WASP-91
TOI-110 = HATS-30
TOI-115 = HATS-46
TOI-108 = HATS-13
TOI-103 = HATS-3
TOI-111 = HATS-34
TOI-112 = WASP-119

Several of these candidates orbit bright HD# stars, some orbit stars that don't appear to be in SIMBAD. A weird one is TOI-127 / 2MASS J01021585-6143458 which is listed by SIMBAD as an RGB star ... which would make a 3-day transiting planet improbable. Though the DVR for TOI-127 lists a radius of 1.000 solar-radii.

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Re: TESS News and Results

Post by Sirius_Alpha on 4th October 2018, 9:02 pm

HD 202772A B: A Transiting Hot Jupiter Around A Bright, Mildly Evolved Star In A Visual Binary Discovered By Tess
https://arxiv.org/abs/1810.02341

We report the first confirmation of a hot Jupiter discovered by the Transiting Exoplanet Survey Satellite (TESS) mission: HD 202772A b. The transit signal was detected in the data from TESS Sector 1, and was confirmed to be of planetary origin through radial-velocity measurements. HD 202772A b is orbiting a mildly evolved star with a period of 3.3 days. With an apparent magnitude of V = 8.3, the star is among the brightest known to host a hot Jupiter. Based on the 27days of TESS photometry, and radial velocity data from the CHIRON and HARPS spectrographs, the planet has a mass of 1.008+/-0.074 M_J and radius of 1.562+/-0.053 R_J , making it an inflated gas giant. HD 202772A b is a rare example of a transiting hot Jupiter around a quickly evolving star. It is also one of the most strongly irradiated hot Jupiters currently known.

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Re: TESS News and Results

Post by Sirius_Alpha on 8th October 2018, 9:10 pm

Prospects for the use of TESS to follow-up on the Kepler field.

Observations of the Kepler Field with TESS: Predictions for Planet Yield and Observable Features
https://arxiv.org/abs/1810.02826

Prospects for Refining Kepler TTV Masses using TESS Observations
https://arxiv.org/abs/1810.02852

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Re: TESS News and Results

Post by Sirius_Alpha on 21st October 2018, 11:31 pm

Led_Zep wrote:https://archive.stsci.edu/prepds/tess-data-alerts/
Data Products From TESS Data Alerts ("TESS-DATA-ALERTS")

Apparently we should be watching that page more. Sector 2 planets were added, including a three-planet system around the very nearby (~10 pc) star L 98-59.

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Re: TESS News and Results

Post by Borislav on 21st October 2018, 11:49 pm

I calculated that out of 29 known transit planets within a radius of 30 parsecs, TESS accounts for 7 discoveries or 24%! (L 98-59, Pi Mesa, LHS 3844, GJ 3090, GJ 4332).

Interestingly, the distance to L 98-59 was determined for the first time only with Gaia (only two years ago!).

https://twitter.com/ericmamajek/status/776497265233965057
EricMamajek wrote:
Nearest star in @ESAGaia #GaiaDR1 TGAS that appears to have previously lacked trig parallax is M2 dwarf TYC 9193-2365-1 (d=10.55+-0.11 pc).
12:05 - 15 september 2016 г.

In a couple of years, this little-known system will become the opposite of one of the most famous!

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Re: TESS News and Results

Post by Sirius_Alpha on 30th October 2018, 11:52 am

We've got a new spectrometer working on TESS candidate planets.

New instrument joins the hunt for Earth-like planets
https://phys.org/news/2018-10-instrument-earth-like-planets.html

On its first night in operation, Veloce targeted an M dwarf that TESS had found to host a planet just 1.4 times the size of the Earth that is orbiting its star every 0.46 days.
"With Veloce our first target was a nearby star called Tau Ceti. We then immediately switched to science targets and over the next 10 nights observed new candidate planets from NASA's TESS mission, as well as a handful of known planets from previous work and stars known not to have planets to measure instrumental stability," said Professor Tinney.

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Re: TESS News and Results

Post by Edasich on 31st October 2018, 4:45 am

Very appetizing pieces of news... Very Happy
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Re: TESS News and Results

Post by Borislav on 3rd November 2018, 8:13 am

New update
https://archive.stsci.edu/prepds/tess-data-alerts/

On south ecliptic pole began search planet's transit with help merger data from sector 1 and sector 2.

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Re: TESS News and Results

Post by Sirius_Alpha on 5th November 2018, 10:01 pm

A Jovian planet in an eccentric 11.5 day orbit around HD1397 discovered by TESS
https://arxiv.org/abs/1811.01882

The Transiting Exoplanet Survey Satellite TESS has begun a new age of exoplanet discoveries around bright host stars. We present the discovery of HD 1397b (TOI-120.01), a giant planet in an 11.54day eccentric orbit around a bright (V=7.9) G-type subgiant. We estimate both host star and planetary parameters consistently using EXOFASTv2 based on TESS time-series photometry of transits and CORALIE radial velocity measurements. We find that HD 1397b is a Jovian planet, with a mass of 0.419−0.024 MJup and a radius of 1.023+0.023−0.026$ RJup. Characterising giant planets in short-period eccentric orbits, such as HD 1397b, is important for understanding and testing theories for the formation and migration of giant planets as well as planet-star interactions.

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