آکادمی اخترزیست‌شناسی ایران | United States America (US)

Create: 2024-02-17 Update: 2024-04-27 17:56:17

🙋🏻‍♀️سلامی از دور به کوچک‌ترین سیاره‌ی فراخورشیدی🪐

🔭 ستاره‌شناسان با استفاده از تلسکوپ فضایی هابل ناسا/ESA، کوچک‌ترین سیاره فراخورشیدی را مشاهده کردند.

☁️ در جو آن سیاره بخار آب کشف شده است. دما این سیاره، به‌اندازه زهره نزدیک به 425 درجه سانتی‌گراد است.

🤔هنوز نمیدانیم که آیا هابل به کمک طیف‌سنجی، مقدار اندکی آب را در اتمسفری غنی از هیدروژن شناسایی کرده است و یا اینکه اتمسفر این سیاره واقعا سرشار از آب میباشد!

در صورتِ صحتِ گزینه دوم؛ احتمالا جو این سیاره روزگاری غنی از هیدروژن/هلیوم بوده اما این مولکول‌ها تحت تابش ستاره‌ای تبخیر شده‌اند و اکنون آبِ مشاهده‌ شده، بقایای آن اتمسفر اولیه است.

🧐در هرصورت، اگر این سیاره دارای اتمسفر غنی از آب باشد، پس باید دورتر از ستاره میزبان خود شکل گرفته باشد؛ جایی که دما پایین است و آب به شکل یخ در آمده، نه مکان فعلی‌اش!

در این سناریو، سیاره پس از تشکیل به ستاره نزدیک‌تر ‌شده و تشعشع بیشتری دریافت کرده، سپس هیدروژن گرم شده و از گرانش ضعیف سیاره فرار کرده (یا هنوز در حال فرار است)

💭 نظریه جایگزین این است که این سیاره در نزدیکی ستاره‌ای داغ با ردّی از آب در اتمسفر آن شکل گرفته.

منتظر اخبار جدید مرتبط با این عضو کوچک به‌تازگی کشف‌شده‌ی کیهان می‌مانیم.🥹

🕵🏻گردآونده: رایان جعفری
✍🏻مترجم: آوا خسروی
🖊️ویراستار: زهرا متقی‌زاده، امیرحسین ساغری

🔎منبع:
https://www.esa.int/Science_Exploration/Space_Science/Hubble_finds_water_vapour_in_small_exoplanet_s_atmosphere

🔭🛰️سفر به‌اعماق کیهان، با آکادمی اخترزیست‌شناسی ایران🚀✨

🆔: @Ir_academy_astrobiology

آکادمی اخترزیست‌شناسی ایران

ESA

Hubble finds water vapour in small exoplanet’s atmosphere

Astronomers using the NASA/ESA Hubble Space Telescope observed the smallest exoplanet where water vapour has been detected in its atmosphere. At only approximately twice Earth’s diameter, the planet GJ 9827d could be an example of potential planets with water…

hottg.com/Ir_Academy_astrobiology/570

7.0K viewsedited Feb 17 at 06:59

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🙋🏻‍♀️سلامی از دور به کوچک‌ترین سیاره‌ی فراخورشیدی🪐

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